计算4x^2+9y^2-6xy
用公式计算(2y-3x)(4y²+6xy+9x²﹚
(x^2+xy/x-y)/(xy/x-y)计算
x-y/xy-y^2计算
计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2
计算(xy-y^2)÷x-y/xy
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
计算x²y³-2x(4xy³)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
分式计算6x平方-3xy+7y平方 分之3x平方-4xy+2y平方
计算:(x+y/x-y)÷(xy+x^2)