Question

Calculati trei numere rationale, stiind ca sunt direct proportionale cu 5, 7 sirespectiv, 12, iar suma lor este 252.
Dau coroana

Answer 1

a/5=b/7=c/12=k
a=5k
b=7k
c=12k
5k+7k+12k=252
k=252/24
k=10.5
a=10.5×5=52.5
b=10.5×7=73.5
c=10.5×12=126
verificare 52.5+73.5+126=252