计算(x-y)³-1 27(x-3)³-8y³
x³y³-x²y²-xy+1
(x+y)²-(x³+y³)÷(x+y)
试说明代数式 x³y³ - 1/2x²y + y² - 2x³y&su
已知x+y+z=3,x²+y²+z²=19,x³+y³+z³
已知:x+y+z=1,x²+y²+z²=2,x³+y³+z³
分解因式:a³+8 27-8y³ x的四次方-xy的三次方 81+3x³
1、证明x³+y³≥x²y+y²x
3x³-【x³+(6x²-7x)-2(x³-3xy-4y)】,其中x=-1,y=
化简再求值 4x³(-y³)²-3x×(-x)²(-y²)³
初二下册计算:(x-y /x+2y)³
数学整式除法计算:(1)(7x²y³-8x²y³z)÷8x²y&sup
1.已知2x-y=1/3,xy=3,求4x³y-4x²y²+xy³的值(要有计算