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Dau coroana !Exercitiul 20

Dau Coroana Exercitiul 20 class=

Răspuns :

a+b+c=37
c=15+3a
2a=b-12=>2a+12=b
a+2a+12+15+3a=37=> 6a+27=37=> 6a=37-27=>6a=10=> a=10/6=> a=5/3
b=2a+12=> b=2*5/3+12=10/3+12=> b=10/3+36/3=>b=46/3
c=15+3a=> c=15+3*5/3=>c=15+5=20
a+b+c=37=>5/3+46/3+20=51/3+20=51/3+60/3=111/3=37

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