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数学
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1.1+4.4+7.7+10.10……+55.55+58.58
人气:231 ℃ 时间:2019-12-19 07:42:45
解答
原式=(1+4+7..+58)+(.1+.4+.7+1.10……+.55+.58)
=(1+58)*20/2+(0.1+0.58)*20/2
=596.8
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1/1*4+1/4*7+1/7*10+.+1/52*55*+1/55*58=?
计算:1.1+4.4+7.7+10.10+13.13+……+55.55+58.58
4+7+10+.+55+58=?速算
等差数列1,4,7,……它的第20项是() A,55 B,57 C,58 D,61
1 2 5 10 13 26 29 58 【】 2 3 5 8 13 21【】 55 2 1 4 4 6 7 8 10【】 【】 12 找规律
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