(福建专版)2019春八年级数学下册第十六章二次根式16.1二次根式第2课时二次根式的化简知能演练提升(新版)新人教版.docx

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1第 2课时 二次根式的化简知能演练提升能力提升1.已知 a为实数,则 =( )-a2A.a B.-a C.-1 D.02.若 =-a,则实数 a在数轴上的对应点一定在 ( )a2A.原点左侧 B.原点右侧C.原点或原点左侧 D.原点或原点右侧3.若 a3,n0,n-20.|m-n|- -|m-1|n2-4n+4=m-n-(2-n)-m+1=m-n-2+n-m+1=-1.3

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