【導讀】的,解決問題的樂趣.證明當n取時命題成立;用數(shù)學歸納法證明問題時,歸納假設是否一定要用上?例4:自學教材71頁例2,探究72頁練習B第2題.kn時命題成立,那么綜合上述說法,可以證明對于(). 3.利用數(shù)學歸納法證明不等式14131...2111???????nnnn時,由k遞推到1?kn時,應推證的目標不等式是________.。立時,左邊所得的項為()A.1B.21aa??A.Sk+12k+2B.Sk+12k+1+12k+2C.Sk+12k+1-12k+2D.Sk+12k+2-12k+1