> 数学 >
1+
1
2
)×(1-
1
2
)×(1+
1
3
)×(1-
1
3
)×…×(1+
1
99
)×(1-
1
99
)
×(1-
1
2
)
×(1+
1
3
)
×(1-
1
3
)
×…×(1+
1
99
)
×(1-
1
99
)
= ___ .
人气:421 ℃ 时间:2020-02-04 01:22:43
解答
(1+
1
2
)×(1-
1
2
)×(1+
1
3
)×(1-
1
3
)×…×(1+
1
99
)(1-
1
99
),
=(1-
1
2
)×(1+
1
2
)×(1-
1
3
)×(1+
1
3
)×…×(1-
1
99
)(1+
1
99
),
=
1
2
×
3
2
×
2
3
×
4
3
×…×
98
99
×
100
99

=
1
2
×
100
99

=
50
99
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