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2014-01-03T20:02:44+07:00
R=40 cm
h=6 cm
s=20cm
f=20 cm
1/20=1/s+1/s'
1/20-1/20=1/s'
s'=0
1/20-1/6=1/h'
3/60-10/60=1/h'
-7/60=1/h'
h'=-8.57
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