Mathematics
Senior High
このさきどう解けば良いのかが分かりません！答えは載せてあります。
教えてください！
(2) 2, n. 2K-1
5=1.20
5= 1.20 + 2.2 + 3.2² + + n. 2n+
-252
+
cm
1.2 + 2.2² + am
(n-1). 2nd + n. 2^
-S= 1 + 2
↑ 24ut 2nd
-7-27
=1+
1-2
(2) n(2"-1)
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