(潍坊专版)2019中考数学复习第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 Bx2 Cx2 Dx22(2 018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(2016潍坊中考)计算: ( ) 3 3 276(2018广州中考)如图,数轴上点 A 表示的数为 a,化简:a a2 4a 47(2017青岛中考)计算:( ) 2416 68计算: sin 60 .13 1 32 18参考答案1D 2.C 3. A 4.D 5.12 6.2 7.138解:原式 23 12 32 232 12 32 .322

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