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1/7+11/77+111/777+1111/7777+...+1111111/7777777=?

Răspuns :

1/7+ 11/77+ 111/777+ .....+ 1111111/7777777= 1/7+ 1/7+ 1/7+....+ 1/7= 1111111x 1/7 = 1111111/7 ; am simplificat fractiile cu 11, 111, ....