1. (3x-5)²-(8x+7)² 2. (x-y+2)(-x+y+2) 3. (x+4)
2(x+y)+(﹣5x+2y) 合并同类项 3X²-[8X﹣(5X﹣2)﹣7X²]
(2x+y)²-y(y+4x)-8x等于?
{(x-y)²+(x+y)(x-y)}÷2x
计算:[(x+¼y)+(x-¼y)](2x²-1/8y²)
2x²-5x+x²+4x-3x² -3x²y+2xy²+3xy
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
将y=二分之一x²+2x+1,y=2x²-3x+4 ,y=-2x²+4x-5, y=x
已知一个多项式加﹣2x³+4x²y+5y³得到X³-3X²Y+2Y
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
因式分解x³+5x²+3x-9 (x-2)²-(y-2)³-(x
不解方程组{2x+Y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值.
x(x-y)-y(y-x)+(x-y)²因式分解