(枣庄专版)2019届中考数学总复习第1部分第一章数与式第四节二次根式要题随堂演练.doc

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1二次根式要题随堂演练1(2018达州中考)二次根式 中的 x 的取值范围是( )2x 4Ax2 Bx2Cx2 Dx22(2018杭州中考)化简 的结果是( )( 2) 2A2 B2 C2 D43(2018无锡中考)下列等式正确的是( )A( )23 B. 33 ( 3) 2C. 3 D( )2333 34若 (y2) 20,则 xy 的值为( )x y 1A5 B1 C1 D55(2017枣庄中考)实数 a,b 在数轴上对应点的位置如图所示,化简|a| 的结果是( ( a b) 2)A2ab B2abCb Db6(2018枣庄调研)计算 的结果是 12 8 67计算: ( ) 3 3 278(2018广州中考)如图,数轴上点 A 表示的数为 a,化简:a a2 4a 49(2017青岛中考)计算:( ) 2416 610计算: sin 60 .13 1 32 18参考答案1D 2.C 3.A 4.D 5.A66 7.12 8.2 9.13 310解:原式 23 12 32 232 12 32 .322

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