Răspunsuri

2014-08-20T23:28:23+03:00
A+b+c=75

a,b,c    dp cu 3,5,7

a/3= b/5= c/7=k
a=3k
b=5k
c=7k

3k+7k+5k=75
15k=75

k=5

a=3*5=15
b=5*5=25
c=7*5=35
3 5 3
2014-08-21T00:21:09+03:00
{a,b,c} direct prop cu {3,5,7}⇒  \frac{a}{3} = \frac{b}{5} = \frac{c}{7} =k
⇒ a=3k, b=5k, c=7k
a+b+c=75 ⇒ 3k+5k+7k=75⇒ 15k=75⇒k=75:15=5⇒
a=3*5=15
b=5*5=25
c=7*5=35
2 5 2