" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
(a+7b) + (a+8b) = 34
2a + 15b = 34
2#u6 = 12
a+5b = 12 ⇒ dikali 2 ⇒ 2a + 10b = 24
1 - 2 : 5b = 10
b = 2
a + 5b = 12
a + 5(2) = 12
a = 2
S22 = 22/2 (2(2) + 21(2)
= 11 × 46
= 506