-12x³y⁴÷(-3x²y³)·(-1/3xy)
-12x³y⁴÷(-3x²y³)·(-1/3xy)
(3xy)² · (x²+xy-y²)-3xy(3x³y+3x²y
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
【x(x²y²-xy)-y(x²-x³y)】÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
x·(9x³y-3xy²)÷(﹣3x²y) 计算
计算[(x²-y²)/y]²÷(x²+xy)³·(xy/y-x)
因式分解:1、[x(x²y²-xy)-y(x²-x³y)]÷3x²y.
已知x+y=5,xy=3,x³+y³=(x+y)(x²-xy+y²),则1/x&
一.x-y=2,则x²-2xy+y²= 二.x-y=-1,xy=3,则x³y-2x
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
因式分解①9(x+y)²-12(x+y-1/3) ②8-6x-6y+(x+y)²③xy³-