先化简,再求值:2(a^2b+ab^2)-(2ab^2-1+a^2b))-2

问题描述:

先化简,再求值:2(a^2b+ab^2)-(2ab^2-1+a^2b))-2

原式=2a^2b+2ab^2-2ab^2+1-a^2b-2
=2a^2b-a^2b+2ab^2-2ab^2-1
=a^2b-1