(4x²y-³)÷(2-¹x²y³)
已知x²+9y²-4x+6y+5=0,求x²y³的值
2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)+2x^4y^2÷(xy)^2
化简:[(2x-y)平方+(2x+y)(2x-y)-4x(x-y+1)]÷2x
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y
数学题……555{(3x+y)(3x-y)-(x-5y)(5x-y)-(x-2y)²÷(-4x),x=-2.y
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
1.[(x-y)^2-2(y -x)]÷(x-y)
化简求值:[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y,其中x=二分之一,y=2
(2x-y)^2-4(x-y)(x+2y)