是不是這個意思：
一個兩位數(shù),它的值等于自身兩位數(shù)字之和的7倍.這是什么數(shù)?
設十位數(shù)為x,個位數(shù)為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.是神馬意思啊?
which are 7 times as much as the sum of its two didits.是神馬意思啊?
數(shù)學人氣：637 ℃時間：2020-05-28 20:33:23
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