计算:(3x-4y)(9x²+12xy+16y²)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:x•(9x³y-3xy²)/(-3x²y)
计算:(xy-x²)乘 x-y分之xy
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
计算:(-7x²y)(2x²y-3xy³+xy)
(xy-x²)²÷(x-y)²/xy·x-y/x² 计算
计算:(xy-x²)×x-y/xy
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
分式计算:(x²+2xy+y²)/(x²y+xy)*y/(x+y)
计算:x²y-(2xy²-5x²y)+3xy²-y³
计算:(3xy)²(x²-y²)-(4x²y²)²÷8y
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)