Jawabanmu

2014-06-05T13:52:39+07:00
1/f = 1/s + 1/s'
1/s' = 1/f - 1/s
1/s' = 1/15 - 1/10
1/s' = 2-3/30
1/s' = -5 /30
s' = -1/6
2014-06-05T13:55:18+07:00
1/f = 1/s + 1/s(aksen)
1/15 = 1/10 + 1/s(aksen)
1/s(aksen) = 1/15 - 1/10
1/s(aksen) = 2/30 - 3/10
1/s(aksen) = 30/-1
1/s(aksen) = -30