> 数学 >
探索并计算.
1
2
1
1×2
=1−
1
2

1
6
1
2×3
1
2
1
3

1
12
1
3×4
1
(   )
1
(   )

计算:
1
2
+
1
6
+
1
12
+
1
20
+
1
30
+…+
1
90
人气:410 ℃ 时间:2020-02-21 14:21:12
解答
1
12
=
1
3×4
=
1
3
-
1
4

1
2
+
1
6
+
1
12
+
1
20
+
1
30
+…+
1
90

=
1
1×2
+
1
2×3
+
1
3×4
+
1
4×5
+
1
5×6
+…+
1
9×10

=
1
1
-
1
2
+
1
2
-
1
3
+
1
3
-
1
4
+…+
1
9
-
1
10

=1-
1
10

=
9
10
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