👤

VA ROOGGG!!Folosimd metoda factorului comun, calculeaza:

7×a +9×b +2×c

Daca a+b=43 si b+c=15


Răspuns :

a+b=43
b+c=15

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



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