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3a +2b/a+7b=12/13
CALCULATI a/b


Răspuns :

3a +2b/a+7b=12/13

13(3a+2b)=12(a+7b)

39a+26b=12a+84b

39a-12a=84b-26b

27a=50b    (produsul mezilor=produsul extremelor)

a/b=50/27