>
数学
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用简便方法计算:
2
3
+
2
15
+
2
35
+
2
63
+
2
99
.
人气:487 ℃ 时间:2019-09-30 06:16:04
解答
2
3
+
2
15
+
2
35
+
2
63
+
2
99
=
1−
1
3
+
1
3
−
1
5
+
1
5
−
1
7
+
1
7
−
1
9
+
1
9
−
1
11
=
1−
1
11
=
10
11
.
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