3x³-3x²-y²+5y+x²-5y+y²(要过程)
x(x-y)-y(y-x)+(x-y)²因式分解
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知一个多项式加﹣2x³+4x²y+5y³得到X³-3X²Y+2Y
因式分解x²(x-2y)+y²(2y-x)
计算:(2x+y)²-(x+2y)²(要过程)
x²+y²-4x+6y+13=0,求(3x+y)²-3(3x+y)(x+y)-(x-3y)
5X²-3Y²-(X²-Y²)-2(X²+4Y²)其中|X+
12x²-3y² (2x+y)²-(x+2y)²
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
因式分解 -5x³y(x-y)³+20y【x²(y-x)】²
分解因式(x+y)3次方-y(x+y)平方+x平方(y+x)
(2x+y)²-y(y+4x)-8x等于?