(x+1)(x-1)(x²-x+1)(x²+x+1)求高手两种方法解
(x+1)(x-1)(x²-x+1)(x²+x+1)={(x+1))(x²-x+1)}{(x-1)(x²+x+1)}=(x...
(x+1)(x-1)(x²-x+1)(x²+x+1)
={(x+1))(x²-x+1)}{(x-1)(x²+x+1)}
=(x³+1³)(x³-1³)
=x六次方-1 (这种已知) 展开
={(x+1))(x²-x+1)}{(x-1)(x²+x+1)}
=(x³+1³)(x³-1³)
=x六次方-1 (这种已知) 展开
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