tentukan hasil penjumlahan berikut : A) 5 ∑ 4-2k k=1 B) 10 ∑ 1/k+2 k=1 C) 6 ∑ k+(k+1)(k+2) k=1
Matematika
agu9
Pertanyaan
tentukan hasil penjumlahan berikut :
A) 5
∑ 4-2k
k=1
B) 10
∑ 1/k+2
k=1
C) 6
∑ k+(k+1)(k+2)
k=1
A) 5
∑ 4-2k
k=1
B) 10
∑ 1/k+2
k=1
C) 6
∑ k+(k+1)(k+2)
k=1
1 Jawaban
-
1. Jawaban DB45
Sigma
a.
5
∑ 4- 2k
k = 1
.
k =1 --> a = 4-2 = 2
b= -2
s5 = 5/2 (2a - 4b)
s5 = 5/2 (4 -8)
s5 = 5/2 (-4) = -10
b.
k = 1 --> a = 1/1 +2 = 3
k = 2 --> u2 = 1/2 + 2 = 2 1/2
k = 3 --> u3 = 1/3 + 2 = 2 1/3
...
2 + 2 1/2 +...+ 2 1/10
2(10) + (1/2 + 1/3 +...1/10)
20 + (2)
= 22