化简:(x+y)(x-y)-2(4-y^2+1/2x^2) 赶紧回答吧,
化简:(x+y)(x-y)-2(4-y^2+1/2x^2) 赶紧回答吧,
1、x(x-y)(x+y)-x(x+y)^2
化简:(2x-y)²-4(x-y)(x+y)
(1)(x^2/x)-y-x-y
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
化简:[(2x-y)平方+(2x+y)(2x-y)-4x(x-y+1)]÷2x
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [(x+y)(x-y)-(x-y)^2+2y(x-y
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,
化简:{(x+2y)(2y-x)-4y(-x+y) } / (-2x)
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)