化简求值 ab^3+a^2b^3+2-2ab+3ab^3-a^2b^3+2ab-1,a=1,b=-1
问题描述：
化简求值 ab^3+a^2b^3+2-2ab+3ab^3-a^2b^3+2ab-1,a=1,b=-1
答
ab^3+a^2b^3+2-2ab+3ab^3-a^2b^3+2ab-1
=ab^3+3ab^3+1
=4ab^3+1
=4(1)(-1)^3+1
=4(1)(-1)+1
=-4+1
=-3