化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
化简(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y)
2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方
(x+y)(x-y)-(2xy+3y)平方
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
1.(x-2y)(x+2y)-(x平方+y)(x平方-y) 2.(2x-y)(y+2x)-(2y+x)(2y-x)
化简(x-2y)平方-(2x-y)(-2x-y)+(x-5y)(x+2y)
(3x-y)的平方-(2x+y)的平方-5(x-y),化简
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
1、x(x-y)(x+y)-x(x+y)^2
【x-3y][x+y]-[x-2y][x +2y]-[x-y
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)