“1+2+3+4.+80+81+82+83”怎样简便运算?
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“1+2+3+4.+80+81+82+83”怎样简便运算?
“1+2+3+4.+80+81+82+83”怎样简便运算?
“1+2+3+4.+80+81+82+83”怎样简便运算?
(1+83)/2 * 83
平均数乘以个数
(1+83)*83/2=3486
和1加到100一个算法,就是(首项+末相)*项数/2