2(x-y)² -(2x-y)(-y+2x).求计算.
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
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]
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
计算:(3x-y)2-(2x+y)2+5x(y-x)
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
(x+y)^2-(3x-2y)^2计算
计算 x+2y+﹙4y²/x-2y﹚+﹙4x²y/4y²-x²)
初二下册计算:(x-y /x+2y)³