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ID:40721771
大小:2.43 MB
页数:59页
时间:2019-08-06
《2013年世纪金榜高中全程复习方略详细答案1》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、第二节直线的交点坐标与距离公式Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.三年2考高考指数:★1.能用解方程组的方法求两条相交直线的交点坐标;2.掌握两点间的
2、距离公式、点到直线的距离公式,会求两条平行直线间的距离.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.1.两点间距离公式、点到直线的距离公式,两平行线间的距离公
3、式是高考的重点;2.常与圆、椭圆、双曲线、抛物线交汇命题;3.多以选择题和填空题为主,有时与其他知识点交汇,在解答题中考查.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePt
4、yLtd.1.两条直线的交点直线l1:A1x+B1y+C1=0与l2:A2x+B2y+C2=0的公共点的坐标与方程组的解一一对应.相交⇔方程组有_______,交点坐标就是方程组的解;平行⇔方程组_____;重合⇔方程组有_________.唯一解无解无数组解Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAs
5、pose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.【即时应用】(1)思考:如何用两直线的交点判断两直线的位置关系?提示:当两直线有一个交点时,两直线相交;没有交点时,两直线平行;有无数个交点时,两直线重合.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluat
6、iononly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.(2)直线l1:5x+2y-6=0与l2:3x-5y-16=0的交点P的坐标是____.【解析】由直线l1与l2所组成的方程组得:,∴直线l1:5x+2y-6=0与l2:3x-5y-16=0的交点P的坐标是(2,-2).答案:(2,-2)Evaluationonly.CreatedwithAspose.Slidesfor.NET
7、3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.(3)直线l1:5x+2y-6=0与l2:5x+2y-16=0的位置关系是______.【解析】∵由直线l1与l2所组成的方程组无解,∴直线l1与l2平行.答案:平行Evaluationonly.Creat
8、edwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.2.距离两
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