题目内容

1
4×5
+
1
5×6
+
1
6×7
+…+
1
99×100

1
1×3
+
1
3×5
+
1
5×7
+…+
1
99×101

5
6
-
7
12
+
9
20
-
11
30
+
13
42
-
15
56

511×
373737
737373
(1)
1
4×5
+
1
5×6
+
1
6×7
+…+
1
99×100

=
1
4
-
1
5
+
1
5
-
1
6
+
1
6
-
1
7
+…+
1
99
-
1
100

=
1
4
-
1
100

=
6
25


(2)
1
1×3
+
1
3×5
+
1
5×7
+…+
1
99×101

=
1
2
×(1-
1
3
+
1
3
-
1
5
+
1
5
-
1
7
+…+
1
99
-
1
101
),
=
1
2
×(1-
1
101
),
=
1
2
×
100
101

=
50
101


(3)
5
6
-
7
12
+
9
20
-
11
30
+
13
42
-
15
56

=
1
3
+
1
2
-(
1
3
+
1
4
)+(
1
4
+
1
5
)-(
1
5
+
1
6
)+(
1
6
+
1
7
)-(
1
7
+
1
8
),
=
1
2
+
1
3
-
1
3
-
1
4
+
1
4
+
1
5
-
1
5
-
1
6
+
1
6
+
1
7
-
1
7
-
1
8

=
1
2
-
1
8

=
4
8
-
1
8

=
3
8


(4)511×
373737
737373

=511×
37×10101
73×10101

=511×
37
73

=259.
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