计算3x²y×5/12xy²×(-4y/5x)(2)6x³y²÷(-y/x)×x
计算4(x+y)^5(x-y)^4÷[2(x+y)³*(y-x)²]
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
计算:x²y-(2xy²-5x²y)+3xy²-y³
(xy-x²)²÷(x-y)²/xy·x-y/x² 计算
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
计算:(x+2y)(3x-5y)-(6x的四次方y²-2x²y²)÷(2x²y&
计算:(-7x²y)(2x²y-3xy³+xy)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]