化简求值3x[xy-2x(y-2x)]+3y(x²-y²),其中x=-1,y=2
化简求值3x[xy-2x(y-2x)]+3y(x²-y²),其中x=-1,y=2
化简求值3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²其中x=3、y=-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:x-y/x²-2xy+y²-xy+y²/x²-y²,其中(x
①化简求值:2(x^2y+xy)-3(x^2y-xy)-4x^2y,其中x=1,y=-1.
化简求值 3x²y-[2xy-2(xy-2/3x²y)]+x²y²,其中x=3,
化简求值:2(x的平方y+xy)-3(x平方y+xy)-4x平方y,其中x=-1,y=2
化简求值(x²-4y²)/(4x²-8xy)其中x=2,y=-3
化简求值:3(2X²Y-3XY²)-2(2XY²-3X²Y),其中X=1,Y=-
化简求值:(x+y)(x-y)+(x-y)²-(6x²y-2xy²)÷2y,其中x=-2,
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
化简求值 【2x²-(x+y)(x-y)][(x+y-1)(x-y+1)+1-2y],其中x=-1,y=-2