问题 填空题
计算:
(1+
7
1
)(1+
7
2
)(1+
7
3
)(1+
7
4
)(1+
7
5
)(1+
7
6
)
(1+
9
1
)(1+
9
2
)(1+
9
3
)(1+
9
4
)(1+
9
5
)
(1+
7
7
)(1+
7
8
)(1+
7
9
)
(1+
9
6
)(1+
9
7
)
=______.
答案

原式=

8
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16
9
10
1
11
2
12
3
13
4
14
5
15
6
16
7

=

8•9
8•9

=1.

故答案为:1.

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