设圆(x-1)²+(y+2)²=25,直线l:(2m+1)x+(m+1)y-7m-4=0(m∈R)(1):求证无论m何值,直线与圆总交于两点;(2):求直线被圆截得的弦长最小值,并求此直线方程;急用,感谢大侠们了.
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![设圆(x-1)²+(y+2)²=25,直线l:(2m+1)x+(m+1)y-7m-4=0(m∈R)(1):求证无论m何值,直线与圆总交于两点;(2):求直线被圆截得的弦长最小值,并求此直线方程;急用,感谢大侠们了.](/uploads/image/z/2484856-64-6.jpg?t=%E8%AE%BE%E5%9C%86%EF%BC%88x-1%EF%BC%89%26%23178%3B%2B%EF%BC%88y%2B2%EF%BC%89%26%23178%3B%3D25%2C%E7%9B%B4%E7%BA%BFl%3A%EF%BC%882m%2B1%EF%BC%89x%2B%EF%BC%88m%2B1%29y-7m-4%3D0%EF%BC%88m%E2%88%88R%EF%BC%89%EF%BC%881%EF%BC%89%EF%BC%9A%E6%B1%82%E8%AF%81%E6%97%A0%E8%AE%BAm%E4%BD%95%E5%80%BC%2C%E7%9B%B4%E7%BA%BF%E4%B8%8E%E5%9C%86%E6%80%BB%E4%BA%A4%E4%BA%8E%E4%B8%A4%E7%82%B9%EF%BC%9B%EF%BC%882%EF%BC%89%EF%BC%9A%E6%B1%82%E7%9B%B4%E7%BA%BF%E8%A2%AB%E5%9C%86%E6%88%AA%E5%BE%97%E7%9A%84%E5%BC%A6%E9%95%BF%E6%9C%80%E5%B0%8F%E5%80%BC%2C%E5%B9%B6%E6%B1%82%E6%AD%A4%E7%9B%B4%E7%BA%BF%E6%96%B9%E7%A8%8B%EF%BC%9B%E6%80%A5%E7%94%A8%2C%E6%84%9F%E8%B0%A2%E5%A4%A7%E4%BE%A0%E4%BB%AC%E4%BA%86.)
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