Dapatkan perbandingan antarsuku berurutan dari suku ke-8 dari tiap-tiap barisan bilangan berikut ini: A. 64,-96,144,-216,.... B. ⅔ , ⅓ , 1/6 , 1/12,.... C. xy,x²y,x³y,x⁴y,... D. 7/3, 1 ,3/7 ,9/49,....
Ridafahmi
A. r = -96/64 = -3/2 U8 = 64 × (-3/2)^7 = 64 × -2187/128 = -1093 1/2
U8 = 64 × (-3/2)^7
= 64 × -2187/128 = -1093 1/2
B. r = 1/3 : 2/3 = 1/3 × 3/2 = 1/2
U8 = 2/3 × (1/2)^7 = 2/3 × 1/128 = 1/192
C. r = x^2 y / xy = x
U8 = xy × x^7 = x^8 y
D. r = 1 : 7/3 = 3/7
U8 = 7/3 × (3/7)^7 = 7/3 × 2187/823543 = 729/117649