化简求值:(x+y)(x-y)+(x-y)²-(6x²y-2xy²)÷2y,其中x=-2,
化简求值:(x+y)(x-y)+(x-y)²-(6x²y-2xy²)÷2y,其中x=-2,
化简求值:x-y/x²-2xy+y²-xy+y²/x²-y²,其中(x
化简求值(x+y)(x-y)-(x-y)²-6x²y/2y+(2xy)²/(-4xy)其中
化简求值(x+y)(x-y)-(x-y)²-6x²y除2y+(2xy)²除(-4xy)其中
化简求值3x[xy-2x(y-2x)]+3y(x²-y²),其中x=-1,y=2
1.化简求值:(x+y)(x-y)-(x-y)²-6x²y÷2y+(2xy)²÷(-4xy
化简求值 【2x²-(x+y)(x-y)][(x+y-1)(x-y+1)+1-2y],其中x=-1,y=-2
先化简在求值(x+y)²-(x-y)(x+y)-(xy)²÷(xy),其中x,y是方程组『3x+2y
(x+y)(x-2y)(x²-4y²) 其中x=8 y=-8 化简求值
化简求值:(x+2y)²-(x+y)(x-y),其中x=-2,y=二分之一
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:(2x²y-2xy²)-【(-3x²y²+3x²y)】,其中