1) {a,b,c}dp {3,5,7}
a+b+c=105
a/3=b/5=c/7=k
a=3k
b=5k
c=7k
3k+5k+7k=105
15k=105
k=105/15
k=7
a=3k=3·7=21
a=21
b=5k=5·7
b=35
c=7k=7·7
c=49
21+35+49=105
b) (a+b)/c=(21+35)/49=56/49=1,(142857)
2) AOB≡DOC
DOC=70 grade
AOB+BOC+DOC+AOD=360 grade
AOD≡BOC
70+2AOD+70=360
2AOD=360-70-70
2AOD=220
AOD=220/2
AOD=110 grade
BOC=110
70+70+110+110=360
