Jawabanmu

2014-04-26T23:19:53+07:00
1/s = 1/f - 1/s'
     = 1/9 - 1/6
    = 2/18 - 3/18
    = -1/18
s = -18
2014-04-26T23:20:51+07:00
1/s = 1/f - 1/s'
1/s = 1/9 - 1/6
1/s = 2/18 - 3/18
1/s = -1/18 
s/1 = 18/-1
s    = - 18 cm
jadi, jarak benda yaitu -18 cm

sekian dan terima kasih...=)