Question

Cái này mình ra Đá r nhx nó cứ kiểu j ý. Mn cs thể lm cho mik check dc ko

Answer 1

\(ĐK:x\ne\pm2\\ 1,E=\dfrac{x^2+x^2-3x+2-x-2}{\left(x-2\right)\left(x+2\right)}=\dfrac{2x\left(x-2\right)}{\left(x-2\right)\left(x+2\right)}=\dfrac{2x}{x+2}\\ 2,E=\dfrac{3}{4}\Leftrightarrow\dfrac{2x}{x+2}=\dfrac{3}{4}\Leftrightarrow3x+6=8x\Leftrightarrow x=\dfrac{6}{5}\left(tm\right)\\ 3,\left|x-4\right|=2\Leftrightarrow\left[{}\begin{matrix}x-4=2\\4-x=2\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=6\left(tm\right)\\x=2\left(ktm\right)\end{matrix}\right.\Leftrightarrow x=6\\ \Leftrightarrow E=\dfrac{6\cdot2}{6+2}=\dfrac{12}{8}=\dfrac{3}{2}\)