Question

Calculați : 3*b+3*c, dacă b+c=15 ; a*b+a*c, dacă a=4,b+c=23 ; ac-bc, dacă a-b=27 si c=5.

Answer 1

3*b+3*c= 3(b+c)=3*15=45;
a*b+a*c=a(b+c)=4*23=92;
ac-bc=c(a-b)=5*27=135

Answer 2

3*(b+c)=3*15=45
a*(b+c)=4*23=92
c*(a-b)=5*27=135