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How to solve this problem?

發問:

When a 5-digit number, ABCDE, is multiplied by 4, the product is the 5-digit number,EDCBA. Find A,B,C,D and E. (fast!!) 更新: (expression) ABCDEx4=EDCBA

最佳解答:

Interesting question! You can work out from this: As both numbers are 5-digit, A can only be 1 or 2. A cannot be 3 or more. Any number after multiplying by 4, it should become an even number. So A cannot be 1 because the product is EDCBA. Therefore, A must be 2. Since A is 2, E must be 8. By logical deduction like this, you will get the answer. 2010-03-14 23:36:17 補充： And the answer is 21978 x 4 = 87912

其他解答:

21978*4=87912