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簡單MATHS

發問:

ＡＢＣＤ ＋ＡＤＢＣ ＿＿＿＿＿＿＿＿ ＤＣＢＡ 我想知道: A,B,C同D係咩數 只要放到個數入去計得岩就ok了 冇任何限制既 ｔｈｘ

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the operation can be rewrite as the following format : (1000A+100B+10C+D)+(1000A+100D+10B+C)=(1000D+100C+10B+A) =>2000A+110B+11C+101D=1000D+100C+10B+A =>1999A+100B-89C-899D=0 By subing different combination of prime number from 0 to 9 , we hv A = 1, B = 6, C = 9, D = 2

其他解答:

a=2 d=3 c=9 b=6|||||(3) B+D+1=9|||||(1) D+C=10+A (2) C+B=B ...... therefore, C=9 (3) B+D=9 (4) A+A=D Form (1) D+9=10+A ...... therefore, D =1+A Solve (1) and (4) ...... A=1 Answer: A = 1, B = 6, C = 9, D = 2