x*(x+2)+2=-x
Giúp mk nha
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
`(x+2)/(x-2)-2/(x^2-2x)=1/x`
ĐK:`x ne 0,x ne +-2`
Nhân 2 vế với `x^2-2x ne 0` ta có pt
`x(x+2)-2=x(x-2)`
`<=>x^2+2x-2=x^2-2x`
`<=>4x=2`
`<=>x=1/2.(tm)`
Vậy `S={1/2}`
ĐK:\(x\ge0\)
\(\left(x^2-1\right)\sqrt{x}=0\Leftrightarrow\left(x-1\right)\left(x+1\right)\sqrt{x}=0\\ \Leftrightarrow\left[{}\begin{matrix}x-1=0\\x+1=0\\\sqrt{x}=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\left(tm\right)\\x=-1\left(ktm\right)\\x=0\left(tm\right)\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\\x=0\end{matrix}\right.\)
Ủa lớp 7 sao học căn r nè
\(x:\left[\dfrac{8}{5}\cdot\left(\dfrac{2}{3}\right)^2-\dfrac{2}{5}\right]=\dfrac{15}{7}+\dfrac{6}{5}\left[\left(2\dfrac{1}{7}\right)^2-\dfrac{50}{49}\right]\)
\(\Leftrightarrow x:\left[\dfrac{32}{45}-\dfrac{18}{45}\right]=\dfrac{15}{7}+\dfrac{6}{5}\cdot\left(\dfrac{225}{49}-\dfrac{50}{49}\right)\)
\(\Leftrightarrow x:\dfrac{14}{45}=\dfrac{15}{7}+\dfrac{6}{5}\cdot\dfrac{25}{7}\)
\(\Leftrightarrow x:\dfrac{14}{45}=\dfrac{45}{7}\)
\(\Leftrightarrow x=2\)
a) \(\left|x\right|+x\)
Vì \(\left|x\right|\ge0\) nên ta có 3TH:
TH1: \(x>0\)
\(\Rightarrow\left|x\right|+x=2x\)
TH2: \(x=0\)
\(\Rightarrow\left|x\right|+x=0\)
TH3: \(x< 0\)
\(\Rightarrow\left|x\right|+x=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x+1=8\\x+1=-8\end{matrix}\right.\Leftrightarrow x\in\left\{7;-9\right\}\)
x.(x+2)+2=-x
\(\Leftrightarrow\)x2 + 2x + x + 2=0
\(\Leftrightarrow\)x2 + 3x + 2=0
\(\Leftrightarrow\)(x+1).(x+2) =0
\(\Leftrightarrow\orbr{\begin{cases}x+1=0\\x+2=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-1\\x=-2\end{cases}}}\)
\(x\left(x+2\right)+2=-x\)
\(x^2+2x+2=-x\)
\(x^2+2x+2+x=0\)
\(x^2+3x+2=0\)
\(\left(x+1\right)\left(x+2\right)=0\)
\(Th1:x+1=0\Leftrightarrow x=-1\)
\(Th2:x+2=0\Leftrightarrow x=-2\)