5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）}
问题描述：
5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）}
答
答案是=5xy^2-2x^y-4x^2y^3-4x^3y^2
答
原式=5xy^2-[2x^2y-(3xy^2-xy^2+2x^2y)/（-1/2xy）]
=5xy^2-[2x^2y-(2xy^2+2x^2y)/（-1/2xy）]
=5xy^2-(2x^2y+4y+4x)
=5xy^2-2x^2y-4y-4x