2019年中考数学《二次根式》专题复习试卷（含答案）

《2019年中考数学《二次根式》专题复习试卷（含答案）》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、2018-2019学年初三数学专题复习二次根式一、单选题1.若是二次根式，则x的取值范围是(        )A. x＞2                                 B. x≥2                                 C. x＜2                                 D. x≤22.下列式子中，正确的是 （   ）。A.                B.                C.                D

2、. 3.说法错误的个数是                （    ）①只有正数才有平方根；②-8是64的一个平方根③；④与数轴上的点一一对应的数是实数。A. 1个                                   B. 2个                                   C. 3个                                   D. 4个4.下列二次根式中，属于最简二次根式的是（  ）A.                         

3、             B.                                      C.                                      D. 5.下列二次根式中，与能够合并的是（  ）A.                                       B.                                       C.                                       D. 6.计算的结果是（

4、  ）A. 6+2                                B. 6                                C. 4                                D. 2+27.计算(+1)2018×(−1)2017的结果是（    ）A. 1                                     B. −1                                     C. +1              

5、                       D. −18.如果a为任意实数,下列各式中一定有意义的是（ ）A.                               B.                               C.                               D. 9.要使有意义，x的取值范围是（  ）A. x≥5                                     B. x≤5                            

6、         C. x＞5                                     D. x＜510.已知xy＞0，化简二次根式x的正确结果为（　　）A.                                 B.                                 C. -                                D. -11.若二次根式有意义，则x的取值范围是(    )A. x≠1                         

7、        B. x＞0                                 C. x＞1                                 D. x≥112.下列运算中，正确的是（  ）A. （2）2=6                                                    B. =﹣C. =+                                        D. =×13.已知一个直角三角形的周长是4+，斜边上的中线长是

8、2，则这个三角形的面积是（　　）A. 5                                       B.                                        C.                                        D. 114.已知，则的值为（ ）A.                                       B. ±2