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一道好的试题,往往具有丰富的内涵、典型的代表性和拓展性,极具教学开发价值.在平时的教学中,若对其进行适当的发散研究,可以让学生达到深化认识、举一反三的目的.试题(2011届苏北四市一调第18题)已知椭圆E:x2/8+y2/4=1的左焦点为F,左准线l与x轴的交点是圆C的圆心,圆C恰好经过坐标原点O,设G
A good test question often has rich connotation, typical representativeness and expansibility, and is of great value in teaching and learning.It can make students achieve the purpose of deepening understanding and giving top priority to everything from normal teaching to divergent research . Question papers (2011 Northern Jiangsu four cities a tune No. 18) Known ellipse E: x2 / 8 + y2 / 4 = 1 left focus is F, the left alignment l and x-axis intersection is the center of the circle C, Circle C just after the coordinate origin O, set G