计算[(x+y)2-(x-y)2]÷(2xy).
计算:3xy[2xy-x(y-2)+x]
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
分式计算:(x²+2xy+y²)/(x²y+xy)*y/(x+y)
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
计算,(x^2-xy)/(xy^2)·y/(y-x) 分式的 乘法,
计算 (x²+2xy+y²)(x²-xy+y²)²
计算:(-7x²y)(2x²y-3xy³+xy)
计算 (x平方+2xy+y平方)(x平方-xy+y平方)平方
计算 2xy[4x²y²-3y(xy+x²y)-xy²]