[tex] \frac{a}{b} = \frac{7}{5} =\ \textgreater \ 5a=7b=\ \textgreater \ a= \frac{7b}{5} \\
a*b=1260=\ \textgreater \ \frac{7b ^{2} }{5}=1260 =\ \textgreater \ \\
7b ^{2} =6300=\ \textgreater \ b^{2} =900=\ \textgreater \ b=30 \\
a=210:5=42
[/tex]
Rezultatul final: a=42 b=30 .
