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第一章二次根式一、选择题1.下列的式子一定是二次根式的是(  )A.                                  B.                                  C.                                  D. 2.下列各运算中,正确的是(  )A. 30+3﹣3=﹣3                 B. -=                 C. (2a2)3=8a5                  D. ﹣a8÷a4=﹣a43.若=﹣a成立,则满足的条件是(  )A. a>0                                     B. a<0                                     C. a≥0                                     D. a≤04.化简的结果是( )A. 4                                        B. 3                                        C. 3                                        D. 95.要使式子有意义,则x的取值范围是(  )A. x>0                                    B. x≥﹣2                                    C. x≥2                                    D. x≤26.使代数式8有意义的的范围是(  )A.                                   B.                                   C.                                   D. 不存在7.使代数式有意义的x的取值范围是(  )A. x>3                                  B. x≥3                                  C. x>4                                  D. x≥3且x≠48.已知:a、b均为实数,下列式子:①;②;③;④;⑤.其中是二次根式是个数有(  )个.A. 1个                                       B. 2个                                       C. 3个                                       D. 4个 9.如果(3+)2=a+b(a、b为实数),则a+b等于( )A. 9                                          B. 18                                          C. 12                                          D. 610.当a>0时,的化简结果是                               (    )A. x                              B. x                              C. -x                              D. -x二、填空题11.根式中x的取值范围是________ .12.计算:=________.13.如果x<﹣4,那么|(2﹣x)﹣|的值为________.14.当a=________时,|a﹣|=﹣2a.15.已知n是一个正整数,是整数,则n的最小值是________.16.计算:=________.17.若平行四边形相邻的两边长分别是cm和cm,其周长为________cm.18.填空:的值等于________.19.化简:=________.20.相邻两边长分别是2+与2﹣的平行四边形的周长是________.三、解答题21.求使 有意义的x的取值范围.22.已知y=++4,求|y﹣2x|﹣﹣的值. 23.计算下列各式(1)计算:﹣4+÷(2)计算:(﹣)2+(+)(﹣)24.观察下列等式:①;②;③;…回答下列问题:(1)仿照上列等式,写出第n个等式:________;(2)利用你观察到的规律,化简:;(3)计算:…. 参考答案一、选择题CDDBDCDCBD二、填空题11.x≤312.13.414.≤015.316.17.1418.﹣3.119.20.8三、解答题21.【解答】由原式得x-3>0,4-x>0,综上得3 查看更多

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