3x³-12xy²
2x²-12xy²+8xy³
(3xy)² · (x²+xy-y²)-3xy(3x³y+3x²y
分解因式:3x³-12xy²
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
计算[5xy²(x²-3xy)-(-3x²y²)³]÷(-5xy)
因式分解3x-12x³,x²+y²-1-2xy
x²-2xy+y²分之x²+2xy-3y³如何因式分解
计算:(-7x²y)(2x²y-3xy³+xy)
[-xy/(x-y)²]²×(y²-xy/x)³
-3(2x²-xy)+4(x²+xy-6)
先化简,再求值 4(xy²+3xy-2x²y)-[12xy-3(3x²y-2xy²
若xy³=-3,则-xy【x²y五次方-xy³-y】的值为