问题:

观察下列各式,回答问题
1-
1
22
=
1
2
×
1
3
1-
1
32
=
2
3
×
4
3
1-
1
42
=
3
4
×
5
4
….
按上述规律填空:
(1) 1-
1
1002
=______×______, 1-
1
20052
=______×______.
(2)计算: (1-
1
22
)×(1-
1
32
)
…× (1-
1
20042
)×(1-
1
20052
)

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