试题:
1
2
+
5
6
+
11
12
+
19
20
+…+
9899
9900
=______.

答案:

我来补答
1
2
+
5
6
+
11
12
+
19
20
+…+
9899
9900

=(1-
1
2
)+(1-
1
6
)+(1-
1
12
)+(1-
1
20
)+…+(1-
1
9900

=99-(
1
2
+
1
6
+
1
12
+
1
20
+
1
30
+…+
1
9900

=99-(1-
1
2
+
1
2
-
1
3
+
1
3
-
1
4
+
1
4
-
1
5
+
1
5
-
1
6
+…+
1
99
-
1
100

=99-(1-
1
100

=99-1+
1
100

=98+0.01
=98.01.
故答案为:98.01.
 
 
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