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numerele a, b, c sunt direct proportionale cu 4,5 si 8 si 2a+3b+5c=630.Aflati a, b, c

Răspuns :

A/4=a/5=a/8=k => a=4k b=5k c=8k 2•4k+3•5k+5•8k=630 8k+15k+40k=630 63k=630 k=10 => a=40 b=50 c=80