1/3+1/15+1/35+1/63+…+1/9999.
问题描述:
+1 3
+1 15
+1 35
+…+1 63
. 1 9999
答
+1 3
+1 15
+1 35
+…+1 63
,1 9999
=(1-
+1 3
-1 3
+1 5
-1 5
+…+1 7
-1 99
)×1 101
,1 2
=(1-
)×1 101
,1 2
=
×100 101
,1 2
=
.50 101