Question

[Lê Mai Tuyết Hoa]

Thực hiện phép tính ;

a,\(\dfrac{1}{xy-x^2}-\dfrac{1}{y^2-xy}\)             b, \(\dfrac{x+3}{x-2}+\dfrac{4+x}{2-x}\)

Answer 1

[Nguyễn Hoàng Minh]

\(a,=\dfrac{1}{x\left(y-x\right)}-\dfrac{1}{y\left(y-x\right)}=\dfrac{x-y}{xy\left(y-x\right)}=\dfrac{-1}{xy}\\ b,=\dfrac{x+3-x-4}{x-2}=\dfrac{-1}{x-2}\)