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Flaviu22
a fost răspuns

numerele a, b, c sunt invers proportionale cu 2, 3, 4. Daca 5a+3b-c=45, determinati numerele a, b, c....

Răspuns :

Alexandravert
{a, b, c} i.p {2, 3, 4}=>
2a=3b=4c
a=3b/2
4c=3b=>c=3b/4
5*3b/2+3b-3b/4=45
15b/2+3b-3b/4=45
30b+12b-3b=45
39b=45
b=45/39
b=15/13=>a=3*15/13*1/2=45/26
c=3*15/13*1/4=45/52

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