3x²y-8x³-5xy²-______=2x³-3y³ 快
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
已知xy²=-6,求xy(x³y的七次方-3x²y的五次方-11.5y)的值
因式分解:xy³-2x²y²+x³y
[xy(x²-3y)+3xy²]﹙﹣2xy﹚+x³y²﹙2x-y﹚ 其中x=﹣1
已知多项式-6xy²-7x³m-1y²加3分之4x³y-x²y-5
多项式-½x³y+3xy³-5x²y³-1是几次几项式,
计算:【[2/(3x)-2/(x+y)×[(x+y/(3x)-x²-xy)]】÷(x-y)/x
已知:(x+2)²+|x+y-10|=0,求3x²y-[5x²y-﹙2xy-x²
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
计算:x²y-(2xy²-5x²y)+3xy²-y³
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
【x(x²y²-xy)-y(x²-x³y)】÷3x²y