violympic 8 vong 17

D

duc_2605

Gọi số cần tìm là $\overline{abcde4}$
$\overline{4abcde} = 4 \ x\ \overline{abcde4} $
$400000 +\overline{abcde} = 40 \ x \ \overline{abcde} + 16 $
$400000 +\overline{abcde} = 40 \ x \ \overline{abcde} + 16 $
$399984 = 39 \ x \ \overline{abcde}$ => $\overline{abcde} = 10256$
=> $\overline{abcde4} = 102564$
 
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