曲线y=
•
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切线指的是一条刚好触碰到曲线上某一点的直线。更准确地说，当切线经过曲线上的某点（即切点）时，切线的方向与曲线上该点的方向是相同的。平面几何中，将和圆只有一个公共交点的直线叫做圆的切线。
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撒贝宁高考押题小能手 从《觉醒时代》的角度剖析高考作文题
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2021年6月8日 am10:21
已知向量a=(3,1)，b=(1,0)，c=a+kb，
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