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a+b+c=603
b:a=1/3
c=7/45 din a
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Răspuns :

a+b+c=603
b:a=1/3 b=a/3
c=7a/45
a+a/3+7a/45=603
45a+15a+7a=27135
67a=27135
a=405
b=405/3=135
c=7*405/45=63