Jawabanmu

2014-04-16T22:46:49+07:00
S10=1/2.10(3.10-1)
       =5(30-1)
        =5.29
         = 145
2014-04-16T22:47:40+07:00
S10=1/2*10(3*10-1) S10=5(30-1) S10=145