bskk dikumpulinn Kak!

2.) beda = 1
un= a+ (n-1)×b
u12=1+ (12-1)×1
=1+ (11.1)
=1 + 11
= 12


3.) u6=2 u10=32
a.r(pangkat 5)= 2 a.r(pangkat 9)= 32
5 4
a.r .r =32 u6=2
4 5
2. r =32 a.r =2
4 5
r =32 a.2 =2
r = 4akar 32 a.32=2
r = 2 a = 2/ 32
a = 1/ 16
n-1
un = a.r
14-1
u14= 1/16 . 2
13
= 1/16 . 2
= 1/16 . (8.192)
= 512

4.) u3 = 14 u7 = 26
a+2b = 14 a+6b = 26

eliminasi : sub :
a+2b = 14 a+2b = 14
a+6b = 26 a+(2×3) = 14
dikurangkan : a+ 6 = 14
-4b = -12 a = 14 - 6
b = -12/-4 a = 8
b = 3
un = a+(n-1)×b
u18 = 8+(18-1)×3
= 8+(17×3)
= 8+ 51
= 59

5.) 1,3,5,7
un = a+(n-1)×b
u25 = 1+(25-1)×2
= 1+ (24×2)
= 1+ 48
= 49