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6+66+666+.....+666...66-(4+44+444+....+444...44)

Răspuns :

6 66 666...666...66-(4 44 444....444...44)= 2 22 222...222...22...
Spidie
6+66+666+.....+666...66-(4+44+444+....+444...44)=
= 6+66+666+.....+666....666-
   -4-44-444- ......-444....444
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2+22+222+.........222....222= 2* (1+ 11+ 111+ ....+111....111)=
= 2*12345......n

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