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No) 13. Dik : S : 30cm
f : 20cm
Dit s' ?
jawab
1/s' = 1/f - 1/s
1/s'= 1/20 - 1/30
1/s' = 3/60 - 2/60
= 1/60
= 60cm
No 9 sama kayak no 12 jawabannya 60cm