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1、名师精编优秀教案3.2 一元二次不等式及其解法（2）导学案【学习目标】1.巩固一元二次方程、一元二次不等式与二次函数的关系；2.进一步熟练解一元二次不等式的解法.【重点难点】：参数的讨论；【知识链接】复习 1：一元二次不等式的解法步骤是1._ 2._ 3._ 4._ 复习 2：解不等式.（1）23710 xx；（2）2250 xx.【学习过程】典型例题例 1 某种牌号的汽车在水泥路面上的刹车距离s m 和汽车的速度x km/h 有如下的关系：21120180sxx.在一次交通事故中，测得这种车的刹车距离大于39.5m，那么这辆汽车刹车前的速度是多少？（精确到0.01km/h）例 2 一个汽车制
2、造厂引进了一条摩托车整车装配流水线，这条流水线生产的摩托车数量x（辆）与创造的价值y（元）之间有如下的关系：22220yxx若这家工厂希望在一个星期内利用这条流水线创收6000 元以上，那么它在一个星期内大约应该生产多少辆摩托车？例 3 产品的总成本y（万元）与产量x之间的函数关系式是23000200.1yxx，(0,240).x若名师精编优秀教案每台产品的售价为 25 万元，求生产者不亏本时的最低产量.动手试试练 1 在一次体育课上，某同学以初速度012/vm s 竖直上抛一排球，该排球能够在抛出点2 m以上的位置最多停留多长时间？（注：若不计空气阻力，则竖直上抛的物体距离抛出点的高度h与时
3、间x满足关系2012hv tgt，其中29.8/gm s）练 2某文具店购进一批新型台灯，若按每盏台灯15 元的价格销售，每天能卖出30 盏；若售价每提高 1 元，日销售量将减少2 盏.为了使这批台灯每天获得400 元以上的销售收入，应怎样制定这批台灯的销售价格？【学习反思】学习小结进一步熟练掌握一元二次不等式的解法、一元二次不等式与一元二次方程以及一元二次函数的关系 知识拓展（1）连结三个“二次”的纽带是：坐标思想：函数值y是否大于零等价于为P(,)x y 是否在x轴的上方.（2）三个“二次”关系的实质是数形结合思想：20axbxc的解2yaxbxc图象上的点(,0)x；20axbxc的解2
4、yaxbxc 图象上的点(,)x y 在x轴的上方的x的取值范围.【基础达标】自我评价你完成本节导学案的情况为（）.A.很好 B.较好 C.一般 D.较差文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R
5、9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编
6、码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R
7、9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编
8、码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R
9、9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编
10、码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1名师精编优秀教案 当堂检测（时量：5 分钟满分：10 分）计分：1.函数2112yxx的定义域是（）.A|4x x或3x B|43xx C|4x x或3x D|43xx2.不等式2223931711()()
11、33xxxx的解集是（）.A2，4 B(,24,)CR D(,24,)3.集合A=2|540 x xx，B=2|560 x xx，则 AB=（）.A|12xx或 34x B|12xx且 34xC1，2，3，4 D|41xx或 23x4.不等式(5)(2)0 xx的解集为 .5.已知两个圆的半径分别为1 和 5，圆心距满足210240dd，则两圆的位置关系为 .【拓展提升】1.求下列不等式的解集：（1）23100 xx；（2）(9)0 xx.2.据气象部门预报，在距离某码头O南偏东 45 方向 600km 处的热带风暴中心A在以 20km/h 的速度向正北方向移动，距风暴中心 450km以内的地
12、区都将受影响.从现在起多长时间后，该码头将受到热带风暴影响，影响时间为多长？文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8
13、R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档
14、编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8
15、R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档
16、编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8
17、R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档
18、编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1名师精编优秀教案文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7
19、Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1
20、J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7
21、Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1
22、J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7
23、Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1文档编码:CL9I3M1B7Y9 HM5N8R9O6A8 ZB3X1J2J1T1