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a+b=42 sunt direct proporționale cu 2 si 5

Răspuns :

a/2=b/5=k
a/2=k⇒a=2k
b/5=k⇒b=5k
2k+5k=42
7k=42
k=6
a=12
b=30
(a,b)d.p(2,5)
a/2=b/5=k
a=2k
b=5k
a/2=k=>a=2k
b/5=k=>b=5k
2k+5k=42
7k=42
k=6
a=12
b=30