Răspuns:
Salut
a)x/25=15/21
x/25=5/7
7x=125
x=125/7
b)40=5/x
40x=5
x=1/8
==evergreen==
a)
x/25=15/21 => 21x=375 => x=121/7
b)
40=5/x=> 40x=5 => x=5/40=>x=1/8
