Jawabanmu

2014-04-26T16:26:23+07:00
1/S=1/f-1/s`
=1/10-1/30
=3-1/30
=2/30
s=30/2=15
Jawaban paling cerdas!
2014-04-26T16:30:39+07:00
S' = 30
f = 10
ditanya s =...?
1/s + 1/s' = 1/f
= 1/10 - 1/30
= 3/30 - 1/30
= 2/30
= 15
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