平面上有两点A(-1,0),B(1,0),P(x,y)为圆x平方+y平方-6x-8y+21=0上一点,求 3x+4y的范围x平方+y平方范围求S=PA平方+PB平方范围求y/(x+4)范围
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![平面上有两点A(-1,0),B(1,0),P(x,y)为圆x平方+y平方-6x-8y+21=0上一点,求 3x+4y的范围x平方+y平方范围求S=PA平方+PB平方范围求y/(x+4)范围](/uploads/image/z/8563930-34-0.jpg?t=%E5%B9%B3%E9%9D%A2%E4%B8%8A%E6%9C%89%E4%B8%A4%E7%82%B9A%28-1%2C0%29%2CB%281%2C0%29%2CP%28x%2Cy%29%E4%B8%BA%E5%9C%86x%E5%B9%B3%E6%96%B9%2By%E5%B9%B3%E6%96%B9-6x-8y%2B21%3D0%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E6%B1%82+3x%2B4y%E7%9A%84%E8%8C%83%E5%9B%B4x%E5%B9%B3%E6%96%B9%2By%E5%B9%B3%E6%96%B9%E8%8C%83%E5%9B%B4%E6%B1%82S%3DPA%E5%B9%B3%E6%96%B9%2BPB%E5%B9%B3%E6%96%B9%E8%8C%83%E5%9B%B4%E6%B1%82y%2F%EF%BC%88x%2B4%EF%BC%89%E8%8C%83%E5%9B%B4)
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