Question

Rezolvati urmatoarele probleme:
a) Daca a+b=15 si c=3, calculati ac+bc;
b) Daca a-b=27 si c=30, calculati ca-cb ;
Multumesc.

Answer 1

$a).a+b=15 \\ c=3 \\ ac+bc=c(a+b)=3 \cdot 15=45 \\ b).a-b=27 \\ c=30 \\ ca-cb=c(a-b)=30 \cdot 27=810$