2008+2007+2006…+3+2+1
2008+2007+2006…+3+2+1
數(shù)學(xué)人氣:211 ℃時(shí)間:2020-02-03 07:09:51
優(yōu)質(zhì)解答
從1開始尾數(shù)是是雙,則取其前一位乘上計(jì)算總個(gè)數(shù)的一半的數(shù)量,如果尾數(shù)為單數(shù)則以最后一個(gè)數(shù)乘上計(jì)算總個(gè)數(shù)的一半加1
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