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11 supra 13 + 1111 supra 1313 +111111 supra 131313 + 11111111 supra 13131313 =....

Răspuns :

[tex]\dfrac{11}{13}+\dfrac{1111}{1313}+\dfrac{111111}{131313}+\dfrac{11111111}{13131313}=\dfrac{11}{13}+\dfrac{11\cdot 101}{13\cdot 101}+\dfrac{11\cdot10101}{13\cdot 10101}+\dfrac{11\cdot1010101}{13\cdot 1010101}=\\\\=4\cdot\dfrac{11}{13}=\dfrac{44}{13}.[/tex]

Green eyes.