find the sum of all multiples of 7 between 200 a

问题描述:

find the sum of all multiples of 7 between 200 a
d 300
1个回答 分类:英语 2014-11-07

问题解答:

我来补答
a1=203, a14=294,s=(203+294)*14/2=3479
 
 
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