Open kewkew1026 opened 4 years ago
<span style=font-family: 宋体; >直接利用待定系数法求出反比例函数解析式即.<span style=font-family: 宋体; >设y=kx<span style=font-family: 宋体; >,把x=2<span style=font-family: 宋体; >时,y=6<span style=font-family: 宋体; >代入得<span style=font-family: Times New Roman; >k=2<span style=font-family: 宋体; >×<span style=font-family: Times New Roman; >6=12<span style=font-family: 宋体; >,<span style=font-family: 宋体; >∴y=12x<span style=font-family: 宋体; >.<span style=font-family: 宋体; >故选<span style=font-family: Times New Roman; >D<span style=font-family: 宋体; >.<span style=font-family: 宋体; >本题主要考查的是利用待定系数法确定反比例函数解析式的方法,熟练掌握待定系数法是解答本题的关键.
<span style=font-family: Times New Roman; >k=2<span style=font-family: 宋体; >×<span style=font-family: Times New Roman; >6=12<span style=font-family: 宋体; >,
<span style=font-family: 宋体; >∴y=12x<span style=font-family: 宋体; >.
<span style=font-family: 宋体; >故选<span style=font-family: Times New Roman; >D<span style=font-family: 宋体; >.
<span style=font-family: 宋体; >直接利用待定系数法求出反比例函数解析式即.<span style=font-family: 宋体; >设<span style=font-family: 宋体; >,把<span style=font-family: 宋体; >时,<span style=font-family: 宋体; >代入得 <span style=font-family: 宋体; >本题主要考查的是利用待定系数法确定反比例函数解析式的方法,熟练掌握待定系数法是解答本题的关键.
<span style=font-family: Times New Roman; >k=2<span style=font-family: 宋体; >×<span style=font-family: Times New Roman; >6=12<span style=font-family: 宋体; >,
<span style=font-family: 宋体; >∴<span style=font-family: 宋体; >.
<span style=font-family: 宋体; >故选<span style=font-family: Times New Roman; >D<span style=font-family: 宋体; >.