> 数学 >
1
3
+
1
15
+
1
35
+
1
63
+…+
1
9999
人气:350 ℃ 时间:2020-03-31 11:29:02
解答
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
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