-3x³+6x²y-3xy²
(3xy)² · (x²+xy-y²)-3xy(3x³y+3x²y
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
因式分解(1) 3x²+6xy(2)x³y-2x²y²+xy³
36x²y-48xy² y(x-y)²-(y-x)³ 3ax²+6ax
x²-2xy+y²分之x²+2xy-3y³如何因式分解
[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
计算:(-7x²y)(2x²y-3xy³+xy)
先化简,在求值9x³-xy²/(3x+y)(9x²-6xy+y²)其中x=1,y
3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+
已知x/y=2,求x²-xy+3y²/x²+xy+6y²的值