1 reply to this topic

[ViTuyet2001]

CMR nếu các chữ số $a,b,c$ thỏa mãn điều kiện $\bar{ab}:\bar{bc}= a:c$ thì $\overline{abbb}:\overline{bbbc}=a:c$

Edited by royal1534, 24-03-2016 - 22:33.

[tungpro1z4]

\dfrac{\overline{ab}}{\overline{bc}}=\dfrac{a}{c} =\dfrac{9a+b}{10b}=\dfrac{999a+111b}{1110b}=\dfrac {999a+a+111b}{1110b+c}=\dfrac{\overline{abbb}}{ \overline { bbbc } }

 

 

 

 

 

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Edited by tungpro1z4, 10-05-2016 - 17:55.