Question

Folosind metodă factorului comun, calculeaza:
1) a•c-c•b daca a - b = 24 si c = 3
2) 7•a+9•b+2•c daca a+b = 43 si b+c = 15
RAPID! VA ROG!!

Answer 1

1) a·c-c·b=c(a-b)=3·24=72
2) 7a+9b+2c= 7a+7b+2b+2c=7(a+b)+2(b+c)=7·43+2·15=301+30=331