Question

Folosind metoda factorului comun, calculeaza 7a+9b+2c daca a+b=43 si b+c=15

Answer 1

7a+9b+2c =
= 7a+7b+2b+2c
= 7(a+b)+2(b+c)
= 7·43+2·15
=301+30
=331

Answer 2

7a+9b+2c=
=7a+7b+2b+2c
=7(a+b)+2(b+c)
=7*43+2*15
=301+30
=331

Sper ca te-am ajutat!