a/b = 7/5
aXb=1260
a/b=7/5 => 5a=7b
axb=1260 / x5
5a x 5b=6300
7b x 5b = 6300
35b^2=6300 /:35
b^2=180
b=rad180
b=6rad5
5a=7b => 5a = 7 x 6rad5
5a = 42rad5
a= 42rad5/5 , amplificam cu rad5
a= 210/5rad5
a= 42/rad5
a/b = 42/rad5/6rad5=42/30
R: a/b=42/30
