Jawabanmu

2014-01-25T19:09:49+07:00
3m-17,5dm = 30dm - 17,5dm = 12,5dm 
12,5dm - 70cm = 125cm - 70cm = 55cm
55cm = 550mm
2014-01-25T22:59:18+07:00
3 m - (17,5dm + 70cm)
3000mm - (1750mm + 700mm)
3000mm - (2450mm)
= a.550 mm

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