(-1/2x²y)³×(-3xy²)²
x³y³-x²y²-xy+1
先化简,再求值:3xy²(-x²y+2x³y²)-4xy(-xy²)·
有这样一道计算题:“计算(2x³-3x²y-2xy²)-(x³-2xy²
计算:(1).(-2xy²)*(3x²y)²
已知x/y=3,求x²+2xy-3y²/x²-xy+y³的值
越快越好(1)(xy²+3)(xy²+3)-2x(-x+y)(2)(x+2)(x²+4)(
计算:3(2x²-3xy²)-2(2xy²-3x²y)
化简再求值 4x³(-y³)²-3x×(-x)²(-y²)³
1-x²+2xy-y²
1已知X-Y=XY=3求(X+Y)²及X³-Y³的值
①先化简,再求值.4(3x²y—1/2xy²)—5(—xy²+3x²y),其中x
求多项式(1)-3x²+3xy-2/1y²与-2/1x²+4xy-2/3y²的差