若|x-a|<h,|y-a|<k,则下列不等式一定成立的是(    )A.|x-y|<2h   

若|x-a|<h,|y-a|<k,则下列不等式一定成立的是(    )

A.|x-y|<2h                          B.|x-y|<2k

C.|x-y|<h+k                         D.|x-y|<|h-k|

答案

思路解析:

|x-y|=|(x-a)+(a-y)|≤|x-a|+|y-a|<h+k.

答案:

C

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