?3??11??11??11?1???1??????????1??2??3??n?? ?234n?14??2?12?1??2?12?1??2?12?1??3?4??1?1?2n?1?1??. ∵2n?1?1?3,
∴
12?3?4??1?1?32n?1?1???4. 即
12?M?34.
?2?12?1??????14分
?3??11??11??11?1???1??????????1??2??3??n?? ?234n?14??2?12?1??2?12?1??2?12?1??3?4??1?1?2n?1?1??. ∵2n?1?1?3,
∴
12?3?4??1?1?32n?1?1???4. 即
12?M?34.
?2?12?1??????14分
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