4x²-y²+2y-1化简
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
化简:(2x-y)²-4(x-y)(x+y)
1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [(x+y)(x-y)-(x-y)^2+2y(x-y
1 4(x-y+1)+y(y-2x)
把4(x-y+1)+y(y-2x)因式分解
4(x-y+1)+y(y-2x)
化简:(x+y)(x-y)-2(4-y^2+1/2x^2) 赶紧回答吧,
化简,并求值2(x-2y)²-4(x+3y)(x-3y)-2(x-y).(y+x)-5(-x-1)²
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)
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1