which are 7 times as much as the sum of its two didits.是神马意思啊?

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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?

which are 7 times as much as the sum of its two didits.是神马意思啊?
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

这是7倍的两didits之和

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