简便计算:(1)(x-2y)(-x+2y) (2)(x+y-2)²
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
简便计算:(1)(x-2y)(-x+2y) (2)(x+y-2)²
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
因式分解x²(x-2y)+y²(2y-x)
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
x(x-y)-y(y-x)+(x-y)²因式分解
计算 x+2y+﹙4y²/x-2y﹚+﹙4x²y/4y²-x²)
{(x-y)²+(x+y)(x-y)}÷2x
利用因式分解计算1/2x(x-y)^2-1/5y(x-y)
计算:(3x-y)2-(2x+y)2+5x(y-x)
计算4(x+y)^5(x-y)^4÷[2(x+y)³*(y-x)²]