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Someguyy
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Nguyễn Lê Phước Thịnh
26 tháng 12 2021 lúc 11:42

a: ĐKXĐ: \(x\notin\left\{-\dfrac{1}{2};\dfrac{1}{2};-2\right\}\)

b: \(B=\dfrac{4x^2+4x+1-4-4x^2+4x-1}{\left(2x-1\right)\left(2x+1\right)}\cdot\dfrac{2x+1}{x+2}\)

\(=\dfrac{8x-4}{2x-1}\cdot\dfrac{1}{x+2}=\dfrac{4}{x+2}\)

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c) tự làm, đkxđ: x1;x1

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nguyễn hải đăng
19 tháng 12 2019 lúc 21:50

ê k bn với mk ik

😘 😘 😘 😘

Lê Trần Thanh Ngân
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tút tút
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Nguyễn Lê Phước Thịnh
8 tháng 12 2021 lúc 21:20

a: ĐKXĐ: \(x\notin\left\{0;-5\right\}\)

Linh Linh
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Nguyễn Lê Phước Thịnh
31 tháng 12 2022 lúc 19:34

a: ĐKXĐ: x<>4; x<>-4

b: \(A=\dfrac{\left(x-4\right)\left(x-1\right)}{\left(x-4\right)\left(x+4\right)}=\dfrac{x-1}{x+4}\)

c: Để A nguyên thì x+4-5 chia hết cho x+4

=>\(x+4\in\left\{1;-1;5;-5\right\}\)

=>\(x\in\left\{-3;-5;1;-9\right\}\)

Ryun chen
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Nguyễn Lê Phước Thịnh
2 tháng 1 2023 lúc 14:29

a: ĐKXĐ: x<>1/2; x<>-1/2; x<>0

b: \(A=\dfrac{4x^2+4x+1-4x^2+4x-1}{\left(2x-1\right)\left(2x+1\right)}\cdot\dfrac{5\left(2x-1\right)}{4x}\)

\(=\dfrac{8x}{4x}\cdot\dfrac{5}{2x+1}=\dfrac{10}{2x+1}\)

diêm minh nhật
3 tháng 1 2023 lúc 20:33

tự làm đi

diêm minh nhật
3 tháng 1 2023 lúc 20:33

dễ vậy cũng hỏi

Hương Thảo
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⭐Hannie⭐
18 tháng 12 2022 lúc 0:20

`a,`

\(x^2-3x\ne0\)

`<=>x(x-3)`\(\ne0\)

\(\Leftrightarrow\left\{{}\begin{matrix}x\ne0\\x-3\ne0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x\ne0\\x\ne3\end{matrix}\right.\)

`b,`

đặt `A=(x^2-6x+9)/(x^2-3x)`

`A= ((x-3)^2)/(x(x-3))`

`A= (x-3)/x`

`c, `

để `x=5`

`=> A= (x -3)/x=(5-3)/5= 2/5`

 

Minh Lệ
18 tháng 12 2022 lúc 0:19

a/ ĐKXĐ: \(x^2-3x\ne0\) \(\Leftrightarrow\) x\(\ne\)0,x\(\ne\)3

b/ \(\dfrac{x^2-6x+9}{x^2-3x}=\dfrac{\left(x-3\right)^2}{x\left(x-3\right)}=\dfrac{x-3}{x}\)

c/ x= 5 => \(\dfrac{x-3}{x}=\dfrac{5-3}{5}=\dfrac{2}{5}\)

Pham Hoang Tu Anh
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ba vu
11 tháng 12 2022 lúc 17:53

giú mới ạ mái em noppj rồikhocroi

tút tút
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Nguyễn Lê Phước Thịnh
8 tháng 12 2021 lúc 21:17

a: ĐKXĐ: \(x\notin\left\{0;1;-1\right\}\)