关于圆的方程的数学问题点P(a,b)为圆(x+1)^2+(y-1)^2=4上任一点,求a-b的最小值提供一个思路什么的也行,求教.
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![关于圆的方程的数学问题点P(a,b)为圆(x+1)^2+(y-1)^2=4上任一点,求a-b的最小值提供一个思路什么的也行,求教.](/uploads/image/z/3772710-54-0.jpg?t=%E5%85%B3%E4%BA%8E%E5%9C%86%E7%9A%84%E6%96%B9%E7%A8%8B%E7%9A%84%E6%95%B0%E5%AD%A6%E9%97%AE%E9%A2%98%E7%82%B9P%EF%BC%88a%2Cb%EF%BC%89%E4%B8%BA%E5%9C%86%EF%BC%88x%2B1%EF%BC%89%5E2%2B%28y-1%29%5E2%3D4%E4%B8%8A%E4%BB%BB%E4%B8%80%E7%82%B9%2C%E6%B1%82a-b%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%E6%8F%90%E4%BE%9B%E4%B8%80%E4%B8%AA%E6%80%9D%E8%B7%AF%E4%BB%80%E4%B9%88%E7%9A%84%E4%B9%9F%E8%A1%8C%2C%E6%B1%82%E6%95%99.)
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