题目内容
(1+
)×(1-
)×(1+
)×(1-
)×…×(1+
)×(1-
)
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(1+
)×(1-
)×(1+
)×(1-
)×…×(1+
)×(1-
)
=(1-
)×(1+
)×(1-
)×(1+
)×…×(1-
)×(1+
),
=
×(
×
×
×
×…×
)×
,
=
×1×
,
=
.
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=(1-
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=
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=
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=
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