化简求值 (x²+y²)(x²-y²)-(x+y)²(x-y)
化简求值 【2x²-(x+y)(x-y)][(x+y-1)(x-y+1)+1-2y],其中x=-1,y=-2
化简求值:x-y/x²-2xy+y²-xy+y²/x²-y²,其中(x
(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:(x+y)(x-y)+(x-y)²-(6x²y-2xy²)÷2y,其中x=-2,
化简下列各式,并求值:3(x-y)²-7(x-y)+8(x-y)²+6(x-y) 其中x=2,y
化简求值:【(x+2y)²-(x+y)(3x-y)-5y²]/2x,其中x=-2,y=二分之一详细过
先化简,后求值[(x-y)²-(x+y)]/(2xy) 先化简,后求值[(x-y)²-(x+y)]/
化简求值 当(x-3/16)²+|y+3/17|=0时,求[(y-2x)·(-2x-y)-4(x-2y)
1.化简求值:(x+y)(x-y)-(x-y)²-6x²y÷2y+(2xy)²÷(-4xy
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