Jawabanmu

2014-02-05T04:21:20+07:00
U5 = 3+(4)2
   =11
S5 = 5/2 ( 2 x 3 + 4x2)
      = 5/2 (14) = 5x7 
      = 35 ^^
2014-02-05T05:25:06+07:00