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Daca a+b+c=15 si x=2, calculaţi expresiile:

a) 2a+2b+2c+10x=
b) 13x+5a+5b+5c.

Răspuns :

a) 2a+2b+2c+10x=2*(a+b+c)+10x=2*15+10*2=30+20=50
b)13x+5a+5b+5c=13x+5*(a+b+c)=13*2+5*15=26+75=101

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