Question

化简求值-ab*(a^2b^5-ab^3-b),其中ab^2=-2

Answer 1

原式=-a^3b^6+a^2b^4+ab^2

=-(ab^2)^3+(ab^2)^2+ab^2

=-(-2)^3+(-2)^2-2

=-(-8)+4-2

=10