题目内容

1+
5
3
+
11
6
+
19
10
+
29
15
+…+
9899
4950
1+
5
3
+
11
6
+
19
10
+
29
15
+…+
9899
4950

=1+2-
1
3
+2-
1
6
+2-
1
10
+2-
1
15
+…+2-
1
4950

=1+2×99-(
1
3
+
1
6
+
1
10
+
1
15
+…+
1
4950
),
=1+198-2×(
1
6
+
1
12
+
1
20
+
1
30
+…+
1
9900
),
=199-2×(
1
2
-
1
3
+
1
3
-
1
4
+
1
4
-
1
5
+
1
5
-
1
6
+…+
1
99
-
1
100
),
=199-2×(
1
2
-
1
100
),
=199-(1-
1
50
),
=199-
49
50

=198
1
50
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