Question

Rút gọn:\(A=\frac{2x^2-xy-3y^2}{2x^2-5xy+3y^2}\)

Answer 1

A = (2x^2+2xy)-(3xy+3y^2) / (2x-2xy)-(3xy-3y^2)

   = (x+y).(2x-3y)/(x-y).(2x-3y) = x+y/x-y

k mk nha

Answer 2

đkxđ \(x\ne y\)

 \(A=\frac{x\left(2x-3y\right)+y\left(2x-3y\right)}{x\left(2x-3y\right)-y\left(2x-3y\right)}=\frac{\left(x+y\right)\left(2x-3y\right)}{\left(x-y\right)\left(2x-3y\right)}=\frac{x+y}{x-y}\)