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Fie a/b=3. Aflati valoarea expresiei a+2b/b.

Răspuns :

a/b=3⇔a=3b
a+2b/b=3b+2b/b=5b/b=5
a/b=3 => a=3b
(a+2b)/b=?
(3b+2b)/b=5b/b=5 
Raspuns: (a+2b)/b=5