计算:(3xy)²(x²-y²)-(4x²y²)²÷8y
(xy-x²)²÷(x-y)²/xy·x-y/x² 计算
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:(xy-x²)×x-y/xy
计算:(3xy)²(x²-y²)-(4x²y²)²÷8y
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
计算:(xy-x²)乘 x-y分之xy
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算:(-7x²y)(2x²y-3xy³+xy)
分式计算:(x²+2xy+y²)/(x²y+xy)*y/(x+y)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
计算:(3x³y)²*(4y)²÷(2xy)³