用数学归纳法证明不等式++…+>的过程中,由n=k推导n=k+1时

用数学归纳法证明不等式的过程中,由nk推导nk1时,不等式的左边增加的式子是________

答案

解析 不等式的左边增加的式子是,故填.

答案 

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