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Teo123417
a fost răspuns

Daca a/b=3/7, aflati cat la suta reprezinta a din a+b.

Răspuns :

   
[tex]\displaystyle\\ \frac{a}{b}=\frac{3}{7}\\\\ \text{Scriem proportia derivata.}\\\\ \frac{a}{a+b}=\frac{3}{3+7}\\\\ \frac{a}{a+b}=\frac{3}{10} =\frac{30}{100} = \boxed{\bf 30\%} \\\\ [/tex]