Tham gia Khóa học hè 2024 trên OLM ngay tại đây!

Hướng dẫn giải chi tiết tất cả các môn kỳ thi tốt nghiệp THPT 2024, xem ngay!

Lịch livestream ôn tập hè tuần 6 dành cho học sinh lớp 4 và lớp 7, tham gia ngay

K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

Mua vip
Tất cả Toán Vật lý Hóa học Sinh học Ngữ văn Tiếng anh Lịch sử Địa lý Tin học Công nghệ Giáo dục công dân Âm nhạc Mỹ thuật Tiếng anh thí điểm Lịch sử và Địa lý Thể dục Khoa học Tự nhiên và xã hội Đạo đức Thủ công Quốc phòng an ninh Tiếng việt Khoa học tự nhiên
TP
Thiện Phạm
14 tháng 9 2017

các bạn giúp mik với : hãy đặt 3 bài toán về phép trừ, 3 bài toán về phép chia
#Toán lớp 5
2
LM
lê minh thanh giảng
14 tháng 9 2017

1-1=                                        3/3=

11-3=                                      18/2=

119-0,2=                                 129/3= 

Đúng(0)
SR
SHIBUKI RAN
24 tháng 10 2018

1-1                                                   3/3

34-45                                               45/5

102-54                                             102/2

Đúng(0)
NT
Nguyễn Thị Trà My
14 tháng 8 2016

các bạn hãy giúp mình ra đề bài có 5 phép tính về nhan 1 số với 1 hiệu và đè toán có lời văn về một số nhân với 1 tổng nhé !

Mình cảm ơn các bạn nhiều.
#Toán lớp 3
4
TT
tran thi ha anh
14 tháng 8 2016

ba ban A , B , C di mua bi A mua 5 vien bi B mua 10 vien bi Hỏi C mua bao nhieu vien biet rang so bi C mua gap 3 lan tong so bi cua A va B ( đe toán về một số nhân với 1 tổng nhé )

Đúng(0)
LS
Lê Sỹ Long Nhật
14 tháng 8 2016

Why ?!!!

Đúng(0)
NM
nguyễn minh hải
20 tháng 8 2021
 Rambo học các phép toán trên trường và hôm nay anh ta học đến phép trừ và làm một bài tập về trừ một số cho 1. Tuy nhiên phép trừ này không đơn thuần như phép trừ bình thường và nó theo mô tả sau:Nếu chữ số cuối cùng của số đó khác không thì trừ số đó đi 1.Nếu chữ số cuối cùng của số đó là 0 thì chia số đó cho 10 (nói cách khác là xóa chữ số cuối cùng).Bạn được cho một số nguyên N và Rambo sẽ thực...
Đọc tiếp

 

Rambo học các phép toán trên trường và hôm nay anh ta học đến phép trừ và làm một bài tập về trừ một số cho 1. Tuy nhiên phép trừ này không đơn thuần như phép trừ bình thường và nó theo mô tả sau:

Nếu chữ số cuối cùng của số đó khác không thì trừ số đó đi 1.

Nếu chữ số cuối cùng của số đó là 0 thì chia số đó cho 10 (nói cách khác là xóa chữ số cuối cùng).

Bạn được cho một số nguyên N và Rambo sẽ thực hiện K lần phép trừ. Nhiệm vụ bạn hãy tìm kết quả sau khi Rambo thực hiện K phép trừ. Kết quả luôn đảm bảo rằng là một số nguyên

Input:

Đầu vào gồm 2 số nguyên N và K (2≤N≤109,1≤K≤50)(2≤N≤109,1≤K≤50) là số nguyên N và K lần thực hiện phép trừ

Output:In ra đáp án sau khi Rambo thực hiện K lần phép trừ
#Tin học lớp 12
2
NM
nguyễn minh hải
20 tháng 8 2021

giúp minhg vs

 

Đúng(0)
AP
Anh Phạm
23 tháng 8 2021

uses crt;

var n,k,i:integer;

begin

readln(n,k);

for i:= 1 to k do

begin

if (n%2=0)and(n%5=0) then n:=n div 10

else n:=n-1;

end;

write(n);

readln;

end.

Đúng(0)
NN
Nhung Nguyen
7 tháng 1 2022
V .  CÁC PHÉP TOÁN VỀ PHÂN THỨC :Bài 1 : Thực hiện các phép tính sau :         b)  x+3/x-2+4+x/2-x                   Bài 2 : Thức hiện các phép tính sau :           a)   x+1/2x+6+2x+3/x2+3x                                        d) 3/2x2y +5/xy2 + x/y3                       e) x/x-2y  +x/x+2y    + 4xy/4y2-x2                                     g)  x+3/x+1 +2x-1/x-1 +x+5/X2-1  ;   ...
Đọc tiếp

V .  CÁC PHÉP TOÁN VỀ PHÂN THỨC :

Bài 1 : Thực hiện các phép tính sau : 

        b)  x+3/x-2+4+x/2-x                   

Bài 2 : Thức hiện các phép tính sau : 

          a)   x+1/2x+6+2x+3/x2+3x                                  

      d) 3/2x2y +5/xy2 + x/y3              

         e) x/x-2y  +x/x+2y    + 4xy/4y2-x2                             

        g)  x+3/x+1 +2x-1/x-1 +x+5/X2-1  ;     
#Toán lớp 8
1
NL
Nguyễn Lê Phước Thịnh
7 tháng 1 2022

Bài 1: 

b: \(=\dfrac{x+3-4-x}{x-2}=\dfrac{-1}{x-2}\)

Bài 2: 

a: \(=\dfrac{x+1}{2\left(x+3\right)}+\dfrac{2x+3}{x\left(x+3\right)}\)

\(=\dfrac{x^2+x+4x+6}{2x\left(x+3\right)}=\dfrac{x^2+5x+6}{2x\left(x+3\right)}=\dfrac{x+2}{2x}\)

d: \(=\dfrac{3}{2x^2y}+\dfrac{5}{xy^2}+\dfrac{x}{y^3}\)

\(=\dfrac{3y^2+10xy+2x^3}{2x^2y^3}\)

e: \(=\dfrac{x^2+2xy+x^2-2xy-4xy}{\left(x+2y\right)\left(x-2y\right)}=\dfrac{2x^2-4xy}{\left(x+2y\right)\cdot\left(x-2y\right)}=\dfrac{2x}{x+2y}\)

Đúng(0)
PP
Phạm Phi Bằng
9 tháng 5 2016

dùng 2 phép toán cộng, trừ và các số từ 0 đến 9. Hãy sắp xếp thành một bài toán có kết quả là 100.
#Toán lớp 5
0
DN
Đỗ Nguyễn Quỳnh Anh
2 tháng 10 2016
Giúp em giải bài toán này với a : Bài 1 : Trong một phép chia có dư , lấy số bị chia trừ đi tích của số chia và số thương được 4 đơn vị .a. Số dư trong phép chia đó là .....b. Số chia bé nhất có thể có trong phép chia đó là ..............Bài 2 : Viết tiếp vào chỗ chấm : a. Trong các phép chia có số dư bằng 6 , số chia bé nhất của các phép chia đó là ..................b. Trong các phép chia có số dư...
Đọc tiếp

Giúp em giải bài toán này với a : 

Bài 1 : Trong một phép chia có dư , lấy số bị chia trừ đi tích của số chia và số thương được 4 đơn vị .

a. Số dư trong phép chia đó là .....

b. Số chia bé nhất có thể có trong phép chia đó là ..............

Bài 2 : Viết tiếp vào chỗ chấm : 

a. Trong các phép chia có số dư bằng 6 , số chia bé nhất của các phép chia đó là ..................

b. Trong các phép chia có số dư bằng 6, số dư lớn nhất của các phép chia đó là............................
#Toán lớp 3
2
NK
Nguyễn Khánh An
4 tháng 2 2017

Bài2:

a, Số chia bé nhât trong phép chia có số dư bang 6 là :

              6+1=7

Vậy số chia là 7

                  Đ/S : số chia là 7

Đúng(0)
NK
Nguyễn Khánh An
4 tháng 2 2017

Bài 2 :

b, Số dư là :

         6 - 1 = 5 

Vậy số dư là 5

           Đ/S : 5

Đúng(0)
VM
Võ Mai Nhật Linh
21 tháng 3 2016

Nam alm2 3 bài toán và 2 phép tính mất 55 phút.Tính thời gian Nam làm mỗi phép tính,mỗi bài toán,biết thời gian làm mỗi bài toán lâu bằng 3 phép tính.

Làm đúng mik tick 2 cái.

 
#Toán lớp 5
1
DN
Đỗ Ngọc Ánh
21 tháng 3 2016

làm 1 phép tính hết 5 phút

làm 1 bài toán hết 15 phút

Đúng(0)
S
seasons4
11 tháng 10 2019

nêu các phép toán trong Q 

phép cộng trừ nhân chia lũy thừa 

giúp mik vssssssssssssssssssssssssssssssssssssssssssssssssssss

cần gấppppppppppppppppppppppppppppppppppppppppppppppppp

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
#Toán lớp 7
1
DL
Đào Lâm Nguyên
24 tháng 1 2022

ok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok okok ok ok

Đúng(0)
PK
Phạm Kim Oanh
5 tháng 4 2022

 Tìm tất cả các số nguyên tố \(p\)   sao cho  \(2^p+p^2\)  cũng là số nguyên tố ?
P/s:  Em xin  phép nhờ quý thầy cô giáo và các bạn yêu toán giúp đỡ em bài toán về chủ đề :  Đồng Dư Thức với ạ!
Em cám ơn nhiều ạ!
#Toán lớp 9
1
XO
Xyz OLM
5 tháng 4 2022

Với p = 2 => 2p + p2 = 8 (loại)

Với p = 3 => 23 + 32 = 17 (loại) 

Nhận thấy với p > 3 => p lẻ 

Đặt p = 3k + 1 ; p = 3k + 2 (k \(\in Z^+\))

Khi đó P = 2p + p2 

= (2p + 1) + (p2 - 1)

Vì p lẻ => 2p + 1 = (2 + 1).(2p - 1 - 2p - 2 + ... + 1) \(⋮3\)(1) 

Với p = 3k + 1 => p2 - 1 = (p - 1)(p + 1) = (3k + 1 - 1)(3k + 1 + 1)

= 3k(3k + 2) \(⋮3\) (2) 

Từ (1) ; (2) => P \(⋮3\)(loại)

Với p = 3k + 2 => p2 - 1 = (p - 1)(p + 1) = (3k + 2 - 1)(3k + 2 + 1)

= 3(k + 1)(3k + 1) \(⋮\)3 (3) 

Từ (1) ; (3) => P \(⋮3\)

=> p = 3 là giá trị cần tìm 

Đúng(1)
PK
Phạm Kim Oanh
5 tháng 4 2022

Dạ hay quá, em cám ơn thầy ạ
Em gặp mấy bài toán về chủ đề : Đồng Dư Thức-  khó  quá
May được thầy giúp đỡ ạ!

Đúng(0)
Bảng xếp hạng
Tất cả Toán Vật lý Hóa học Sinh học Ngữ văn Tiếng anh Lịch sử Địa lý Tin học Công nghệ Giáo dục công dân Âm nhạc Mỹ thuật Tiếng anh thí điểm Lịch sử và Địa lý Thể dục Khoa học Tự nhiên và xã hội Đạo đức Thủ công Quốc phòng an ninh Tiếng việt Khoa học tự nhiên
  • Tuần
  • Tháng
  • Năm
Các khóa học có thể bạn quan tâm
Tổng thanh toán: 0đ (Tiết kiệm: 0đ)
Tới giỏ hàng
Yêu cầu VIP