化简求值 已知:(x+2)2;+|y+1|=0求5xy²-{2xy²-[3xy²(4xy&
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
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
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:[4(xy-1)²-(xy+2)(2-xy)]÷ -1/4 xy,其中x=-2,y=1/5
化简求值:[(xy-2)²+4xy-4]÷(xy),其中x=10,y=1/25
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
化简求值:(-1/3XY)²[xy(2x-y)-2x(xy-y²)],其中X=-3/2,Y=-2
已知2x²-3y²=xy,(xy≠0),求值(4xy-x²)/(xy+2y²)的
分式的化简求值已知x/y=2求x²-xy+3y²/x²+xy+6y²