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Daca a+b=5,7 si b+c=8,6 , cat face 2a+5b+3c? Va rog frumos! Dau coroana!

Răspuns :

[tex]2a+5b+3c=2a+2b+3b+3c=2(a+b)+3(b+c)= \\ \\ =2*5,7+3*8,6=11,4+25,8=\boxed{37,2}.[/tex]
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