2018_2019学年九年级数学上册第二十一章一元二次方程第2课时配方法(1)(作业本)课件(新版)新人教版.ppt

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作业本,第2课时 配方法(1),第二十一章 一元二次方程,1方程3x2+9=0的根为( )A3 B-3 C3 D无实数根 2.下列方程中,不能用直接开平方法的是_,作业本,D,C,3.填空:(1)x2+6x+( )(x+ )2; (2)x28x+( )(x )2; 4若8x2-16=0,则x的值是_,作业本,9,3,16,4,作业本,5.解方程 36x21=0,6.解方程:2x28=07.解方程:(2x)28108.解方程:4(x+3)2=25,作业本,x1=2,x2=2,谢谢!,

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