如图,点A(1,m),B(3,n)为双曲线y=k/x上两点,点P为x轴正半轴上一点,若PA-PB的最大值为2倍根号2,则k=?
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![如图,点A(1,m),B(3,n)为双曲线y=k/x上两点,点P为x轴正半轴上一点,若PA-PB的最大值为2倍根号2,则k=?](/uploads/image/z/10221181-61-1.jpg?t=%E5%A6%82%E5%9B%BE%2C%E7%82%B9A%EF%BC%881%2Cm%EF%BC%89%2CB%EF%BC%883%2Cn%EF%BC%89%E4%B8%BA%E5%8F%8C%E6%9B%B2%E7%BA%BFy%3Dk%2Fx%E4%B8%8A%E4%B8%A4%E7%82%B9%2C%E7%82%B9P%E4%B8%BAx%E8%BD%B4%E6%AD%A3%E5%8D%8A%E8%BD%B4%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E8%8B%A5PA-PB%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E4%B8%BA2%E5%80%8D%E6%A0%B9%E5%8F%B72%2C%E5%88%99k%3D%3F)
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如图,点A(1,m),B(3,n)为双曲线y=k/x上两点,点P为x轴正半轴上一点,若PA-PB的最大值为2倍根号2,则k=?
如图,点A(1,m),B(3,n)为双曲线y=k/x上两点,点P为x轴正半轴上一点,若PA-PB的最大值为2倍根号2,
则k=?
如图,点A(1,m),B(3,n)为双曲线y=k/x上两点,点P为x轴正半轴上一点,若PA-PB的最大值为2倍根号2,则k=?
连接AB并延长与x轴正半轴的交点即为所求的点P
PA-PB=AB=2倍根号2,
所以(n-m)^2+4=8
m-n=2 m=3n
m=3,n=1
k=3
k=3