Question

va rog daca se poate imediat!! Daca a*b=30 si a*c=18,calculati
i) a*(b+c)/16;
ii)a*(b-c)/4

Answer 1

a)a*b=30
   a*c=18
Le adunam:
ab+ac=48
a(b+c)=48
Deci:a(b+c)/16=48/16=3

b)a*b=30
  a*c=18
Le scadem:
  ab-ac=12
  a(b-c)=12
a(b-c)/4=12/4=3