x的九次方+x的六次方+x的三次方-3 因式分解 求大神解答
1个回答
2015-07-26
展开全部
把3分成3个1
x^9+x^6+x^3-3
=(X^9-1)+(X^6-1)+(X^3-1)
=(X^3-1))(X^6+X^3+1)+(X^3-1)(X^3+1)+(X^3-1)
=(X^3-1)(X^6+1+X^3+X^3+1+1)
=(X^3-1)(X^6+2X^3+3)
=(X-1)(X^2+X+1)(X^6+2X^3+3)
x^9+x^6+x^3-3
=(X^9-1)+(X^6-1)+(X^3-1)
=(X^3-1))(X^6+X^3+1)+(X^3-1)(X^3+1)+(X^3-1)
=(X^3-1)(X^6+1+X^3+X^3+1+1)
=(X^3-1)(X^6+2X^3+3)
=(X-1)(X^2+X+1)(X^6+2X^3+3)
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