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A B C D
_____×9
D B C A
ABCD×9=DCBA
A B C D 分别为 一个数字.
求A B C D四个数字为?
人气：168 ℃ 时间：2019-12-13 16:45:10
解答
ABCD × 9 DCBA 因DCBA仍是四位数 所以A必是1,否则ABCD×9不会是四位数 又因D×9的个位数字是1,所以D必是9 将算式写为 1 BC9 × 9 9CB 1 因为B×9没有进位(否则A×9＋进位积就不是四位数) 所以B必然是0(因A=1) 又因C...
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