(x-1)(x+1)
=x(x+1)-(x+1)
=x²+x-x-1
=x²-1
(x-1)(x²+x+1)
=x(x²+x+1)-(x²+x+1)
=x³+x²+x-x²-x-1
=x³-1
明白请采纳,
有新问题请求助,那个,其实我题目还没出完的...等我题目出完您再回答,好吗?请等一等哈...行!
计算: (1)(x-1)(x+1)=x²-1, (x-1)(x²+x+1)=x³-1
计算: (1)(x-1)(x+1)=x²-1, (x-1)(x²+x+1)=x³-1
数学人气:342 ℃时间:2020-01-25 21:43:18
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