Question

kết quả phép nhânxy(x²+x-1)

A.x³y+x²y+xy

B.x³y-x²y-xy

C.x³y-x²y+xy

D.x³y+x²y-xy

 

Answer 1

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

Answer 2

D

Answer 3

D