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a =(5^88-5^87-9·5^86):11

Răspuns :

A =(5^88-5^87-9·5^86):11 =
=5^86×(5^2-5^1-9·5^0):11 =
=5^86×(25-5-9·1):11=
=5^86×(25-14):11=
=5^86×11:11=
=5^86