2018_2019学年九年级数学上册第二十一章一元二次方程第3课时配方法(2)(作业本)课件(新版)新人教版.ppt

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作业本,第3课时 配方法(2),第二十一章 一元二次方程,1用配方法解一元二次方程x26x5=0,则方程变为( ) A(x6)2=41 B(x3)2=14 C(x+6)2=41 D(x+3)2=141 2.将一元二次方程x24x6=0化成(xa)2=b的形式,则b等于( ) A4 B6 C8 D10,作业本,B,D,3用适当的代数式填空:(1)x24x+_=(x_)2; (2)x28x+_=(x_)2;(3)4x2+4x+_=(2x+_)2,作业本,4 2,16 4,1 1,4. 若方程 可化为 则 p=_, q=_. 5将一元二次方程 化成 的形式,则=_,作业本,1,4,6解方程:x2+8x=97.解方程:x2+10x+25=0,作业本,x1=1,x2=-9,解:(1)配方,得 (x+5)2=0,开方,得x+5=0, 解得x=5,x1=x2=5;,8.解方程:2x24x=7,作业本,谢谢!,

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