化简各项4(-xy+2y)-3(2x-xy)
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
(-3x^y+2xy)-( )=4x^+xy
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
已知x-y=4xy,则2x+3xy-2yx-2xy-y
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
(3x-2y+3xy)-(x-4y-2xy),其中x+y=3 xy=-2 化简求值
化简求值3x-2y-5xy-(2x-3y+2xy),其中x+y=4,xy=-7
化简求值3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²其中x=3、y=-1
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
化简求值3x²y-[2xy²-2(xy-3/2x²y)+xy]+3xy² ,当x