Răspuns :
a+b+c=?
c=10
ac+bc=360
(a+b)×10=360, a+b=36
Raspuns: a+b+c=36+10=46
[tex]\it c=10\ \ \ \ (1)\\ \\ a\cdot c+b\cdot c=360 \Rightarrow c\cdot(a+b)=360\ \ \ \ (2)\\ \\ (1),\ (2)\ \Rightarrow 10\cdot(a+b)=360|_{:10} \Rightarrow a+b=36\ \ \ \ (3)\\ \\ \\ (1),\ (3)\ \Rightarrow a+b+c=36+10=46[/tex]