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解题就如破案,一个蛛丝马迹的发现或许会成为整个案件侦破的关键,使一桩错综复杂的迷案势如破竹,真相大白.在不少数学问题中,都隐藏着曲线过定点这一隐含条件,注意到这一点往往对问题的彻底解决起着扭转全局的作用.本文通过几道例题加以说明,供大家参考.例1直线(2k+1)x-ky=4k+2与椭圆x29+y25=1相交于A,B两点,F为椭圆的左焦点,则△FAB的周长等于.思维导航:直线(2k+1)x-ky=4k+2是一条动直线,因而它与椭圆的两个交点A,B也随之
Solve the problem, such as solving a case, the discovery of a clues may become the key to the detection of the entire case, so that a complicated case of wild magic, the truth.Many mathematical problems, are hidden in the curve of the fixed point of this implied conditions, Note that this is often a complete solution to the problem to reverse the overall situation.This paper through a few examples to illustrate, for your reference.Example 1 straight line (2k + 1) x-ky = 4k +2 and the ellipse x29 + y25 = 1 intersects A, B at two points, F is the left focus of the ellipse, then the circumference of △ FAB is equal. Navigation: Straight line (2k +1) x-ky = 4k +2 is a moving straight line, Two intersection A, B also will follow