2018年秋九年级数学上册第二十一章一元二次方程21.2解一元二次方程21.2.3因式分解法解一元二次方程预习学案(新版)新人教版.doc

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2018年秋九年级数学上册第二十一章一元二次方程21.2解一元二次方程21.2.3因式分解法解一元二次方程预习学案(新版)新人教版.doc_第1页
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121.2.3 因式分解法解一元二 次方程一、预习目标及范围:1.了解分解因式法解一元二次 方程的概念2.会用分解因式法解某些一元二次方程范围:自学课本 P12-P14,完成练习.二、预习要点1、分解因式的方法有那些?并用字母表示。(1)(2)(3)2、对比之前学的解一元二次方程的方法 配方法、公式法以及因式分解说明它们的异同点。三、预习检测解下列方程:(1) (x+2 ) ( x-4)=02我的疑惑在预习过程中的存在哪些困惑与建议填写在下面,并与同学交流。_3参考答案预习检测:(1).(x+2) (x-4)=0解:x+2=0 或 x-4=0x 1=-2, x2=4.431.4x(2x+1)-3(2x+1)=0则(4x-3) (2x+1)=04x-3=0,2x+1=0x 1= , x2=-34

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