计算;1、【(x-y)²+(x+y)(x-y)】/2x
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
运用乘法公式计算:(1)(x-y)(x+y)-(2x-y)²
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
用行列式性质计算(需过程):(x,y,x+y; y,x+y,x; x+y,x,y )
利用因式分解计算1/2x(x-y)^2-1/5y(x-y)
计算4(x+y)^5(x-y)^4÷[2(x+y)³*(y-x)²]
计算1):(-x-y) (x+y)二次方 2)(y-x)(x-y)的三次方
计算:(3x-y)2-(2x+y)2+5x(y-x)
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
(x+y)^2-(3x-2y)^2计算