{a;b;c} d.p.{2;3;5}= [tex] \frac{a}{2}=\frac{b}{3}=\frac{c}{5}=K[/tex]
a+b+c=180
[tex] \frac{a}{2} [/tex] =K=a=2K=2X18=36
[tex] \frac{b}{3} [/tex] = K=b=3K=3X18=54
[tex] \frac{c}{5} [/tex]= K=c=5K=5X18=90
2K+3K+5K=180
10K=180
K=180:10
K=18 (MERGI SUS SI INLOCUIESTI)