(x²+4y²)-16x²y² 这题怎么写?
x(x-y)-y(y-x)+(x-y)²因式分解
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)
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
(x-2y)²+(2x-4y)(x+y)+(x+y)²
(2x-y)²-4(x-y)(x+2y)
化简:(2x-y)²-4(x-y)(x+y)
因式分解 (1).(x+y)(x+y-6)+9 (2).x²-16y²-x-4y
因式分解x²(x-2y)+y²(2y-x)
(2x+y)²-y(y+4x)-8x等于?
(x+y)²+4(x+y)-5
[(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做?