化简并求值:4x ³(-y ³)² -3x 乘(-x)²(-y²)&s
化简并求值:4x ³(-y ³)² -3x 乘(-x)²(-y²)&s
化简再求值 4x³(-y³)²-3x×(-x)²(-y²)³
先化简,再求值:3xy²(-x²y+2x³y²)-4xy(-xy²)·
x³y³-x²y²-xy+1
已知x+y+z=3,x²+y²+z²=19,x³+y³+z³
(x+y)²-(x³+y³)÷(x+y)
3a-3b/10ab*25a²b³/a²-b² x²-4y²
已知:x+y+z=1,x²+y²+z²=2,x³+y³+z³
1.计算(-a²b²)÷(-ab²)×(-3ab³)2.先化简再求值「(x-y)
1、(4x²y-2x³)÷(-2x)²
1、证明x³+y³≥x²y+y²x
单项式除以单项式2a²(x-y)³+3a²(y-x)²