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Nguyễn Gia Phúc
Giới thiệu về bản thân
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ta cs xy = -3 = (-1) . 3 = -3
x= -1 ; y = 3 => x+y = (-1) + 3 = 2
x= 3 ; y = -1 => x+y = 3 + (-1) = 2
x= -3; y= 1 => x+y = (-3) + 1 = -2
x= 1 ; y = -3 => x+y = 1 + (-3) = -2
vay ta cs so (x:y) = (-1 : 3 ) va (3 : -1)
dt ao cu la :
600 : 3 = 200
dt ao ms la
200. 4 = 800
dt cai ao hinh vuong
800 : 2 = 400
=> 20 m
chu vi chieudai ao ms la :
20.2=40
chu ao ms la :
(40+20).2=120 (m)
so coc go de coc lm hang rao la :
(120-2) :1 +1= 119 coc go
becase x smallest so x = BCNN ( 3,5,7)
so BCNN ( 3,5,7) = 3.5.7 = 105
so x = 105
a) 1325 - 300 + 3975 = 1025 + 3975 = 5000
b) 260 : [ 5 + 7.3 ] - 3'2 = 260 : 26 - 3'2 = 10 - 3'2 = 1
a) -13/12
b) 0.4
c) 1/3 + 2/3 : x= -1/2
1: x= -1/2
x=-1/2 : 1
x=-1/2
D) 50k x 10 = 50k x 10/100 =5000 =50k - 5k = 45k
45k
a) 18 m2
b) 13,5 kg gao
tu diem MN = MO + ON
OM = 3 cm ON = 2cm
MN = 3+2 = 5 cm
goc BAC = 90'
goc ABC = 75'
goc BCD = 135'
goc CDA = 60'
a) 18 hs
b) 45 hs
c) 20% hs ik bo
a(x)+b(x) =2x3-x2=3x-5
+
2x3+x2+x+5
4x3+4x
B)
goi a:b lan luot la so quyen sach cua hai lop 7a va 7b
a/5=b/6 vs a+b = 121
AP UNG TINH CHAT DAY TI SO BANG NHAU:
TA CO :
A/5 = B/6 = A/5+B/6=121/11=11
SUY RA :
A/5=A.11=5.11=55
B/6=B.11=6.11=66
VAY:
LOP 7A: 55 QUYEN SACH GIAO KHOA
LOP 7B: 66 QUYEN SACH GIAO KHOA