" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
= a + 2d = 10
u7 = a + (7-1)d = 22
= a + 6d = 22
kurangkan yg di bold
-4d = -12
d = 3 ,sub ke a + 2d = 10
a+ 2.3 = 10
a + 6 = 10
a = 4
Sn = n{2a+(n-1)d}
2
S30 = 30 {2.4 + (30-1)3}
2
= 15 ( 8 +29.3)
=15.95 = 1425
22 =a+ 6b _ a+2 . 3 = 10
-12 = - 4b a + 6 = 10
-12/-4 = b a = 10 - 6 = 4
3 = b
*Sn = n/2(2a+(n-1)b)
S30 = 30/2 (2.4 + (30 -1 ) 3)
= 15 ( 8 + 29 . 3)
= 15 . 95 = 1425