[Toán 8] Tìm số tự nhiên

H

hai1206

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T

trinhminh18

Đặt $A=\overline{abcde}$ ta có :
$\overline{abcde1}=3.\overline{1abcde}$
\Rightarrow$10\overline{abcde} + 1= 300000 + 3.\overline{abcde}$
\Leftrightarrow$7\overline{abcde}=299999$
\Rightarrow $\overline{abcde}=42857$
 
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