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同底数,不同指数幂加法法则
5+5^2+5^3+5^4+5^5+5^6
人气:466 ℃ 时间:2019-11-15 06:56:51
解答
5+5^2+5^3+5^4+5^5+5^6
=(5-5*5^6)/(1-5)
=(5-5^7)/(-4)
=(5^7-5)/4
=19530
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