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已知,则= ;

已知6ec8aac122bd4f6e,则6ec8aac122bd4f6e=     

 

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设函数6ec8aac122bd4f6e的图象上的点6ec8aac122bd4f6e处的切线的斜率为k,若6ec8aac122bd4f6e,则函数6ec8aac122bd4f6e的图象大致为(    )

 

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