Jawabanmu

2014-06-17T08:56:18+07:00
1/16=1/12+1/s'
1/s'=1/16-1/12
1/s'=12-16/192
1/s'=-4/192
s'=-48
2014-06-17T10:44:28+07:00
1/si=1/16-1/12
=12-16/192
=-4/192
=-1/48
si=-48cm