化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=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
化简求值:[(xy-2)²+4xy-4]÷(xy),其中x=10,y=1/25
化简求值:【4(xy-1)²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5
化简求值:(-1/3XY)²[xy(2x-y)-2x(xy-y²)],其中X=-3/2,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:[4(xy-1)²-(xy+2)(2-xy)]÷ -1/4 xy,其中x=-2,y=1/5
化简求值:x-y/x²-2xy+y²-xy+y²/x²-y²,其中(x
化简求值(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分
化简求值 已知:(x+2)2;+|y+1|=0求5xy²-{2xy²-[3xy²(4xy&
化简求值:3(2X²Y-3XY²)-2(2XY²-3X²Y),其中X=1,Y=-
化简求值:(负三分之一 xy)²[xy(2x-y)-2x(xy-y²)],其中x=-一又二分之一,y