[y(x-y)+x(x+y)-x²]÷(-y)要过程
{(x,y) |x|+|y|
x>y?x:y
x[x+y][x-y]-x[x-y]² 因式分解是多少?过程 要步奏讲解.
(3x+y)二次方-3(3x-y)(x+y)-(x-2y)(x+3y)要过程!
(x-y)² - (-y-2x)(y-2x) 要过程
(x-y)/(2x+2y)与(xy)/(x+y)²通分要过程
因式分解:x²(x-y)+(y-x)
用行列式性质计算(需过程):(x,y,x+y; y,x+y,x; x+y,x,y )
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
求导数y': x^y=y^x 要有过程
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
计算(2x+y)(3x-2y) 要过程