Question

Rút gọn biểu thức: \(x\left( {{x^2} - y} \right) - {x^2}\left( {x + y} \right) + xy\left( {x - 1} \right)\). 

Answer 1

\(x\left(x^2-y\right)-x^2\left(x+y\right)+xy\left(x-1\right)=x^3-xy-x^3-x^2y+x^2y-xy=-xy\).