Temat:Obliczanie ułamka danej liczby.
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WZÓR:
5/12h=5/12·60min=5·60/12min=25min
3 1/3h=.................................................min
2 2/3h=.................................................min
11/15h=..................................................min
4 3/4kg=..................................................dag
7/10m=....................................................cm
2 13/20m=.................................................cm
137/1000km=..............................................m
3/40km=....................................................m
3/10hektara=...............................................m²
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3 1/3 h =180 min + 1/3 * 60 min = 60/3 min = 200 min
2 2/3 h =120 min + 20 min *2 = 160 min
11/15 h = 11/15 * 60 min = 660/15 min = 44 min
4 i 3/4 kg = 400 dag + 3/4 * 100 dag =400 dag + 75 dag = 475 dag
7/10 m = 7/10 * 100 cm = 70 cm
13/20m = 13/20 * 100 cm = 65 cm
137/1000km= 137/1000 * 1000m = 137 m
3/40 km= 3/40 * 1000m= 75m
3/10 hektara = 3/10 * 10 000 m² = 3000 m²