Zamien 4,2m = dm
6,6dm = m
90s = h
40cm = km
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4,2m = 42 dm , bo 4,2*10= 42
6,6dm = 0,66 m, bo 6,6:10= 0,66
1h= 60min= 60min*60= 3600 s
90s= 90/3600h= 1/40h
1km=1000m=100000cm
40cm= 0,0004km , bo 40:100000= 0,0004
6,6 dm=0,6m
40 cm=0,04km ponieważ metr m1 1000 cm