~Barisan dan Deret
x - 1 - (2x - 7) = 3x - 6 - (x - 1)
x - 1 - 2x + 7 = 3x - 6 - x + 1
-x + 6 = 2x - 5
3x = 11
x = 11/3
(2x - 7) , (x - 1) , (3x - 6) , ...
1/3 , 8/3 , 5 , ... , ...
Sn = [n/2] . [2a + (n - 1) b]
S12 = [12/2] . [2/3 + 11(7/3)]
S12 = 6 . 79/3
S12 = 2 . 79
S12 = 158
#backtoschool2019
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~Barisan dan Deret
x - 1 - (2x - 7) = 3x - 6 - (x - 1)
x - 1 - 2x + 7 = 3x - 6 - x + 1
-x + 6 = 2x - 5
3x = 11
x = 11/3
(2x - 7) , (x - 1) , (3x - 6) , ...
1/3 , 8/3 , 5 , ... , ...
Sn = [n/2] . [2a + (n - 1) b]
S12 = [12/2] . [2/3 + 11(7/3)]
S12 = 6 . 79/3
S12 = 2 . 79
S12 = 158
#backtoschool2019