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【简答题】
两条互相平行的直线分别过点A(6,2)和B(-3,-1),并且各自绕着A,B旋转,如果两条平行直线间的距离为d. 求: (1)d的变化范围; (2)当d取最大值时两条直线的方程.
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he was sure his son was good at his lessons
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