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圆锥曲线弦的中点问题江福贵张艳芬（吉林舒兰市一中１３２６００）（上海松江县教师进修学校２０１６００）求直线被圆锥曲线截得弦的中点问题，屡见不鲜，是一类重要问题．对于有心曲线弦的中点问题，我们可以用切线的斜率和中点与中心连线的斜率的积为常数（±ｂ２ａ２...
The midpoint problem of the cone curve chord Jiang Fugui Zhang Yanfen (Jilin Shizhong No. 132600, Jilin) (Shanghai Songjiang Teachers’ Training School 201600) The mid-point problem of finding a straight line intercepted by a conic section is not uncommon. It is an important issue. For the midpoint problem of the curvilinear curve string, we can use the product of the slope of the tangent and the slope of the center point to be a constant (±b2a2...