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b.15,2dam=1520dm
235m=2350dm
1520+2350=3870dm
c.9,8km=980dam
30hm=300dam
980+300+4,2=1284,3dam
d.130mm=13cm
17dm=170cm
7m=70cm
13+170+70=253cm
e.0,02dam=0,002hm
15m=0,15hm
20m=0,2hm
0,002+0,15+0,2=0,252hm
f.17,2cm=1,72dm
100mm=0,1dm
17,2-0,1=17,1dm