Question

Mn người giúp mik bài này nx

Answer 1

a.

ĐKXĐ: \(\left\{{}\begin{matrix}x\ne-1\\y\ne3\end{matrix}\right.\)

b.

\(E=\left(\dfrac{x-2}{\left(x-2\right)\left(x+2\right)}+\dfrac{x+2}{\left(x-2\right)\left(x+2\right)}\right).\dfrac{\left(x+2\right)^2}{2x}\)

\(=\dfrac{2x}{\left(x-2\right)\left(x+2\right)}.\dfrac{\left(x+2\right)^2}{2x}\)

\(=\dfrac{x+2}{x-2}\)