是不是这个意思：
一个两位数,它的值等于自身两位数字之和的7倍.这是什么数?
设十位数为x,个位数为y.
(x + y)*7 = x*10 + y => x = 2y
答案有：21,42,63,84
which are 7 times as much as the sum of its two didits.是神马意思啊?
which are 7 times as much as the sum of its two didits.是神马意思啊?
数学人气：269 ℃时间：2020-05-28 20:33:23
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