计算:x*(-2x²y)
计算(x²/x+2y)-x+2y-2
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]
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
计算:(x+2y)(3x-5y)-(6x的四次方y²-2x²y²)÷(2x²y&
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
分式计算:(x²+2xy+y²)/(x²y+xy)*y/(x+y)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算:(3x-y)2-(2x+y)2+5x(y-x)
(x+y)^2-(3x-2y)^2计算
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
初二下册计算:(x-y /x+2y)³