题目内容

(1-
1
22
)×(1-
1
32
)×(1-
1
42
)×…×(1-
1
102
)
(1-
1
22
)×(1-
1
32
)×(1-
1
42
)×…×(1-
1
102
),
=(1-
1
2
)×(1+
1
2
)×(1-
1
3
)×(1+
1
3
…×(1-
1
10
)×(1+
1
10
)

=
1
2
×
3
2
×
2
3
×
4
3
×
3
4
×…×
10
9
×
9
10
×
11
10

=
1
2
×
11
10

=
11
20
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