2022年八年级下册数学第十六章分式导学案 .pdf
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1、16.1.1 从分数到分式一、学习目标:1.识记分式、有理式的概念.2.知道分式有意义的条件,分式的值为零的条件;3.能熟练地求出分式有意义的条件,分式的值为零的条件.二、自主预习:自学教材 P2P4 相关内容,并完成以下各题。1.完成教材P2“思考 1”中的空格。2什么叫分式?分式与整式的区别是什么?3判断下列各式中,哪些是整式?哪些不是整式?38nmm2;1xy2z1;213x;x1;1222xx;222abba;三、课堂导学:例 1 填空:当 x 时,分式x52有意义;当 x 时,分式22xx有意义;当 x 时,分式x252有意义;当 x、y 满足关系时,分式yxyx2有意义;例 2 当
2、 m为何值时,分式的值为0(1)1mm(2)32mm (3)112mm四、课堂自测:1判断下列各式哪些是整式,哪些是分式?9x+4,x7,209y,54m,238yy,91x2.当 x 取何值时,下列分式有意义?(1)(2)(3)3.当 x 为何值时,分式的值为0?(1)(2)(3)4、列式表示下列各量:(1)某村有n 个人,耕地40 公顷,人均耕地面积为公顷;(2)ABC的面积为 S,BC边长为 a,则高 AD为;(3)一辆汽车行驶a 千米用b 小时,它的平均车速为千米/小时;一列火车行驶a千米比这辆汽车少用 1 小时,它的平均车速为千米/小时。5、下列式子中,哪些是是分式?哪些是整式?两类
3、式子的区别是什么?x1;3x;5342b;352a;22yxx;nmnm;121222xxxx;)(3bacP8 习题 16.1 第 1、2、3、8、13 题;4522xxxx23523xxx57xx3217xxx22116.1.2 分式的基本性质第一课时一、学习目标:1能辨别分式的基本性质.2会用分式的基本性质将分式变形.二、自主预习:自学教材 P4P6 思考上面,并完成以下各题:1描述分式的基本性质:2用式子表示分式的基本性质:3理解教材P5 例 2 并完成以下各空:(1)3)(32aaaa;yxxxyx32422;(2)2xyxyyx三、课堂导学:例 1 根据分式的基本性质,回答下列问题
4、:(1)abba当分母变为ba2时,分子变为怎样的因式?(2)22xxyx当分子变为x+y 时,分母变为怎样的因式?(3)一个分式的分子为aa2,分式变形后为ca(a+10),则分式变形前分母是怎样的因式?例 2 不改变分式的值,使下列分式的分子和分母都不含“-”号.ab56,yx3,nm2,nm67,yx43四、课堂自测:1填空:(1)xxx3222=3x (2)32386bba=33a(3)cab1=cnan)(4)222yxyx=)(yx2不改变分式的值,使下列分式的分子和分母都不含“-”号.(1)233abyx (2)2317ba(3)2135xa (4)mba2)(3.不改变分式的值
5、,使下列分式的分子与分母的最高次项的系数是正数:(1)13232aaaa(2)32211xxxx(3)1123aaa4不改变分式的值,使分子第一项系数为正,分式本身不带“-”号.文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V
6、8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI
7、7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V
8、8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI
9、7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V
10、8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI
11、7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3(1)baba2(2)yxyx32教材 P8 习题 16.1 第 4、5 题文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z
12、8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L
13、8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z
14、8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L
15、8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z
16、8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L
17、8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z
18、8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T316.1.2 分式的基本性质第二课时一、学习目标:会用分式的基本性质将分式变形,正确进行分式的通分和约分。二、自主预习:自主学习教材P6P7,并完成以下各题:1回答问题:什么是分式的约分?什么是最简分式;什么是分式的通分?什么是最简公分母?2学习教材例3 约分和例4 通分并完成以下两题:(1)322323515cbacba;44422xxx(2)abcbaba与22;3332xxxx与三、课堂导学:例 1 约分:(1)cabba2263(2)532164xyzy
19、zx(3)xyyx3)(2例 2 通分:(1)321ab和cba2252(2)xya2和23xb(3)223abc和28bca(4)11y和11y四、课堂自测:1判断下列约分是否正确:(1)cbca=ba(2)22yxyx=yx1(3)nmnm=0 2.约分:(1)cabba2263;(2)122362xx;3通分:(1)231ab和ba272(2)xxx21和xxx21文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L
20、8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z
21、8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L
22、8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z
23、8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L
24、8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z
25、8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L8V8W9T3文档编码:CH1H2V8Z8X3 HD4C4E6M8N8 ZI7L
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