因式分解:x^9+x^6+x^3-3

x^9+x^6+x^3-3
=(x^9-1)+(x^6-1)+(x^3-1)
=(x³-1))(x^6+x³+1)+(x³-1)(x³+1)+(x³-1)
=(x³-1)(x^6+1+x³+x³+1+1)
=(x³-1)(x^6+2x³+3)
=(x-1)(x²+x+1)(x^6+2x³+3)
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