已知反比例函数y=的图象经过点(1,-2),则k的值为(   ) A.

已知反比例函数y的图象经过点(1,-2),则k的值为(  

A    2   B.- C1      D.-2

答案

-2【解析】反比例函数y的图象经过点(1,-2),表明在解析式y中,当x1时,y=-2,所以kxy1×(2)=-2

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