Question

yun

想問一下這題填空～謝謝幫忙～(*´∀`)~♥

10
k
設 S = 2
2S= 2.
k=1
10
2k
=
1
2¹
3
+
10
+
22
210.
k
1
3
10
3
2.
+…+
=1+-
+
2k
k=1
21
22
210
21 22
4 10
29
=1+-
∴S=2S-S=1+
= 1+
2¹
=1+-21
21 + 22
()()
1-
1
210
2
2
3
4
10
1
30
10
+
#22
2⁹
2¹
+
+
+
22
29
210
3-
10-
10
+
+…+
2
22
23
29
210
10
+
23
2゜ 210
10
=
210

Answer 1

星月

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