Question

calculati trei numere rationale stiind ca sunt direct proportionale cu 5,7.12 iar suma lor este 252

Answer 1

a+b+c=252
a=5k
b=7k
c=12k
a+b+c=252
5k+7k+12+=252
24k=252
k=10,5
a=5*10,5=52,5
b=7*10,5=73,5
c=12*10,5=126
verificare
a+b+c=525
52,5+73,5+126=252

Answer 2

 [tex]\frac{a}{5}=\frac{b}{7}=\frac{c}{12}= \frac{252}{24}=10,5\;\\ \Rightarrow\;a=10,5*5=52,5\;;\;b=10,5*7=73,5\;si\;c=10,5*12=126\;.[/tex]