化简求值:1/2x(^2) y(^3)×(-3xy^2)+(-2xy)^2·xy^3+(1/4y)^2·(2xy)^3,
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
化简求值3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²其中x=3、y=-1
先化简,再求值:3xy²(-x²y+2x³y²)-4xy(-xy²)·
化简求值 已知:(x+2)2;+|y+1|=0求5xy²-{2xy²-[3xy²(4xy&
化简求值:【4(xy-1)²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5
先化简再求值:2(xy^2-2y+1/2xy)-(xy+3xy^2-4y),其中x=4,y=1/2,
化简求值{(-1/2x^3y^4)^3+(-1/6xy^2)^2*3xy^2}/(-1/2xy^2)^3其中X=-2,y
化简求值(1)2x^2y(-2xy^2)^3+(2xy)^3(-xy^2)^2,其中x=3,y=1/4
2x^2y(-2xy^2)^3+(2xy)^3乘(-xy^2)^2,其中x=4 y=1/4 化简求值
化简求值:1/2x^2y^3*(-3xy^2)+(-2xy)^2*xy^3+(1/4y)^2·(2xy)^3,其中x=1
化简求值:(-1/3XY)²[xy(2x-y)-2x(xy-y²)],其中X=-3/2,Y=-2