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(x+1)(x2+1)(x4+1)(x8+1)(x16+1)
(x2+1)意思是X的平方+1
人气:227 ℃ 时间:2020-04-16 15:28:46
解答
(x+1)(x2+1)(x4+1)(x8+1)(x16+1)
=(x+1)(x-1)(x2+1)(x4+1)(x8+1)(x16+1)/(x-1)
=(x32-1)/(x-1)
=1+x+x2+x3+...+x31
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