计算【(x+y)²+(x-y)²】(2x²-2y²)
运用乘法公式计算:(1)(x-y)(x+y)-(2x-y)²
计算4(x+y)^5(x-y)^4÷[2(x+y)³*(y-x)²]
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
(x-2y)²+(2x-4y)(x+y)+(x+y)²
(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?
分式计算:(x²+2xy+y²)/(x²y+xy)*y/(x+y)
计算:(x+2y)(3x-5y)-(6x的四次方y²-2x²y²)÷(2x²y&
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
计算(x²/x+2y)-x+2y-2
计算 x+2y+﹙4y²/x-2y﹚+﹙4x²y/4y²-x²)
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&