(2xy-3)(2xy+3)+(xy+3)^2化简求值 x=1/5 y=-2
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
化简求值3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²其中x=3、y=-1
化简求值:【4(xy-1)²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5
化简求值 已知:(x+2)2;+|y+1|=0求5xy²-{2xy²-[3xy²(4xy&
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
化简求值:(-1/3XY)²[xy(2x-y)-2x(xy-y²)],其中X=-3/2,Y=-2
化简求值3x-2y-5xy-(2x-3y+2xy),其中x+y=4,xy=-7
化简求值:若1/x-21/y=3,求(2x+3xy-2xy)/(x-2xy-y)的值
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:[2x^2y^2-(xy+3)(xy-3)-9]/xy,其中x=2,y=-1/3