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Si = 1 m = 100 cm
Dit : f = ...?
D = ...?
Jwb : 1 = 1 + 1 = 1 + 1 = 4 + 1
f So Si 25 100 100 100
1 = 5
f 100
f = 100
5
f = 20 cm
D = 1 = 1 cm
f 20