" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
U5+u7 = 36 --> 2a + 10b = 36 atau a+5b = 18
.
a+2b = 9
a + 5b = 18
kurangkan --> -3b = - 9 --> b = 3
.
S10 = 10/2 ( u5+u7 -b) = 5(36-3) = 165