Jawabanmu

2014-02-05T22:32:40+07:00
A=4
a+8b=20
8b=16
b=2

S10=5(2a+(n-1)b)
=5(8+9(2))
=5(8+18)
=5.26
=130
2014-02-05T22:38:09+07:00
A=4
b=2
s10= n/2(2a+(n-1)b)
      =5 (8 + 18)
       =5(26)
       = 130