过P(2,1)的直线l交x,y轴正半轴于A,B两点,1.求使△AOB面积最小时l的方程2.PA*PB最小时l的方程只是请问第二问为什么我用截距式(和第一问一样)的方法算出结果不对?(请凑合着看)为什么这
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![过P(2,1)的直线l交x,y轴正半轴于A,B两点,1.求使△AOB面积最小时l的方程2.PA*PB最小时l的方程只是请问第二问为什么我用截距式(和第一问一样)的方法算出结果不对?(请凑合着看)为什么这](/uploads/image/z/3960872-8-2.jpg?t=%E8%BF%87P%EF%BC%882%2C1%EF%BC%89%E7%9A%84%E7%9B%B4%E7%BA%BFl%E4%BA%A4x%2Cy%E8%BD%B4%E6%AD%A3%E5%8D%8A%E8%BD%B4%E4%BA%8EA%2CB%E4%B8%A4%E7%82%B9%2C1.%E6%B1%82%E4%BD%BF%E2%96%B3AOB%E9%9D%A2%E7%A7%AF%E6%9C%80%E5%B0%8F%E6%97%B6l%E7%9A%84%E6%96%B9%E7%A8%8B2.PA%2APB%E6%9C%80%E5%B0%8F%E6%97%B6l%E7%9A%84%E6%96%B9%E7%A8%8B%E5%8F%AA%E6%98%AF%E8%AF%B7%E9%97%AE%E7%AC%AC%E4%BA%8C%E9%97%AE%E4%B8%BA%E4%BB%80%E4%B9%88%E6%88%91%E7%94%A8%E6%88%AA%E8%B7%9D%E5%BC%8F%EF%BC%88%E5%92%8C%E7%AC%AC%E4%B8%80%E9%97%AE%E4%B8%80%E6%A0%B7%EF%BC%89%E7%9A%84%E6%96%B9%E6%B3%95%E7%AE%97%E5%87%BA%E7%BB%93%E6%9E%9C%E4%B8%8D%E5%AF%B9%3F%EF%BC%88%E8%AF%B7%E5%87%91%E5%90%88%E7%9D%80%E7%9C%8B%EF%BC%89%E4%B8%BA%E4%BB%80%E4%B9%88%E8%BF%99)
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