(1/3xy)²*(-12x²y²)÷(-4/3x³y)
先化简,再求值:3xy²(-x²y+2x³y²)-4xy(-xy²)·
x³y³-x²y²-xy+1
3x²-4xy+y²
计算:(1).(-2xy²)*(3x²y)²
已知x/y=3,求x²+2xy-3y²/x²-xy+y³的值
习题15.4 因式分解 5,(3)4xy²-4x²y-y ³ (4)3ax²-3
1.已知2x-y=1/3,xy=3,求4x³y-4x²y²+xy³的值(要有计算
1 3x²+4xy-y²=
化简再求值 4x³(-y³)²-3x×(-x)²(-y²)³
16x³-24x²y²+12xy^4-2y^6
当X-y=1时,求代数式x 四次方-xy³-x³y-3x²y+3xy²+y四次方
若多项式5x²-2mxy-3y²+4xy-3x+1中不含xy项,求(-m³+2m²