Jawabanmu

2014-05-01T20:56:05+07:00
2km = 2000 m
4hm =  400 m
5dam = 50 m
     7m = 7 m +
       2457 m
2014-05-01T21:12:22+07:00
2.10³ + 4.10² + 5.10 + 7 = 2457 m