giúp e vs ạ
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Những câu hỏi liên quan
T
21 tháng 11 2023
1. ĐKXĐ: \(x\ne5\)
\(\dfrac{3x+1}{x-5}+\dfrac{-2x-6}{x-5}\)
\(=\dfrac{3x+1-2x-6}{x-5}\)
\(=\dfrac{x-5}{x-5}\)
\(=1\)
2. ĐKXĐ: \(x\ne\pm1\)
\(\dfrac{x+1}{2x-2}-\dfrac{x^2+3}{2x^2-2}\)
\(=\dfrac{x+1}{2\left(x-1\right)}-\dfrac{x^2+3}{2\left(x^2-1\right)}\)
\(=\dfrac{\left(x+1\right)^2}{2\left(x-1\right)\left(x+1\right)}-\dfrac{x^2+3}{2\left(x-1\right)\left(x+1\right)}\)
\(=\dfrac{x^2+2x+1-x^2-3}{2\left(x-1\right)\left(x+1\right)}\)
\(=\dfrac{2x-2}{\left(2x-2\right)\left(x+1\right)}\)
\(=\dfrac{1}{x+1}\)
TG
15 tháng 4 2022
Trắc nghiệm
Câu 1:B
Câu 2:C
Câu 3:A
Câu 4:C
Câu 5:A
Câu 6:B
Câu 7:D
Câu 8:D
29 tháng 7 2023
a: BC=căn 6^2+8^2=10cm
AM=BC/2=5cm
b:
ΔAEH vuông tại A có AI là trung tuyến
nên IH=IA
=>góc IHA=góc IAH
góc IAH+góc MAB
=góc MBA+góc IHA=90 độ
=>góc IAM=90 độ
=>AI vuông góc AM
19 tháng 10 2021
\(1,\Rightarrow3:\dfrac{9}{4}=\dfrac{3}{4}:x\\ \Rightarrow\dfrac{4}{3}=\dfrac{3}{4}:x\\ \Rightarrow x=\dfrac{3}{4}:\dfrac{4}{3}=\dfrac{9}{16}\\ 2,\)
Nửa chu vi là \(50:2=25\left(cm\right)\)
Gọi cd là a, cr là b (cm)(a,b>0)
Ta có \(a:b=3:2\Rightarrow\dfrac{a}{3}=\dfrac{b}{2}\) và \(a+b=25\left(cm\right)\)
Áp dụng t/c dtsbn:
\(\dfrac{a}{3}=\dfrac{b}{2}=\dfrac{a+b}{3+2}=\dfrac{25}{5}=5\\ \Rightarrow\left\{{}\begin{matrix}a=15\\b=10\end{matrix}\right.\)
Vậy ...
28 tháng 12 2021
2. It is thought that he stole the money.
He is thought to have stolen the money.
3. It is said that she is going to study abroad.
She is said to be going to study abroad.
4. It is thought that the house was broken into last night.
The house was thought to be broken into last night.
H9
HT.Phong (9A5)
CTVHS
12 tháng 8 2023
r) \(100x^2-\left(x^2-25\right)^2\)
\(=\left(10x\right)^2-\left(x^2+25\right)^2\)
\(=\left(10x-x^2-25\right)\left(10x+x^2+25\right)\)
\(=\left(-x^2+10x-25\right)\left(x^2+10x+25\right)\)
\(=-\left(x-5\right)^2\left(x+5\right)^2\)
v) \(\left(x+y\right)^2-2\left(x+y\right)+1\)
\(=\left(x+y\right)^2-2\left(x+y\right)\cdot1+1^2\)
\(=\left(x+y-1\right)^2\)
y) \(12y-36-y^2\)
\(=-y^2+12x-36\)
\(=-\left(y^2-12x+36\right)\)
\(=-\left(y-6\right)^2\)
12 tháng 8 2023
r: =(10x)^2-(x^2+25)^2
=(10x-x^2-25)(10x+x^2+25)
=-(x^2-10x+25)(x+5)^2
=-(x-5)^2(x+5)^2
t: =(2x-1)^2-(x+1)^2
=(2x-1-x-1)(2x-1+x+1)
=3x*(x-2)
v: =(x+y)^2-2(x+y)*1+1^2
=(x+y-1)^2
u: =(x-y+5)^2-2(x-y+5)*1+1^2
=(x-y+5-1)^2
=(x-y+4)^2
x: =-(x^2+2xy+y^2)
=-(x+y)^2
y: =-(y^2-12y+36)
=-(y-6)^2
V
1People won't use flying cars until the year 2050
2Do you think the fuel price will increase next month?
3The mail won't arrive until next week
4I don't think he will take the new position
5We will use solar energy in the future
6If i study, i will pass the exams
7If the sun shines , we will walk to the town
8If he has a temperature , he will see the doctor
9If we travel to London , we will visit the museums
10If Rita forgets her homework, the teacher will give her a low mark