Jawabanmu

2014-04-06T11:03:31+07:00
Dik: s=100cm s'=4kali
dit:f...?
jawab:1/f=1/s+1/s'
=1/100+1/4
=1/100+25/100
=1/100+25/100
1/f=26/100
f=100/26
f=3.84m