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2014-05-07T16:24:06+03:00
Aflati numerele a ,b si c  daca sunt direct proportionate cu 2 , 5 si respectiv 7 si a+b+c=28.
a.................2
b.................5
c.................7
a+b+c=28
a/2 =b/5=c/7
a=2k
b=5k
c=7k
2k+5k+7k=28
14k=28/:14
k=2
a=2k-->a=4
b=5k-->b=10
c=7k--->c=14
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