Question

Efectuați : aa:a (aa+bb) :11 (ab+ba) : (a+b).
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Answer 1

$\it \overline{aa}:a=11\cdot a:a=11\\ \\ (\overline{aa}+\overline{bb}):11=(a+b)\cdot11:11=a+b\\ \\ (\overline{aa}+\overline{bb}):11=11\cdot (a+b):(a+b)=11$