《立方根》专题练习.pdf

1/12 2.3 立方根同步练习一、选择题（共16 小题，每小题4 分，满分64 分）1（4 分）下列说法正确的是（）A的立方根是 B的立方根是 C的立方根是D的立方根不存在2（4 分）下列各式正确的有（）=0；=6；（）3=5；=a；（）3=aA5 个B4个C3 个D2 个3（4 分）如果 b 是 a的立方根（ab 0），那么下列结论正确的是（）A b也是 a的立方根B b 是 a的立方根Cb 是 a的立方根D以上结论均不正确8（4 分）立方根等于本身的数是（）A 1 B0C 1 D 1 或 0 9（4 分）的平方根是（）A 4 B2C 2 D不存在10（4 分）下列说法正确的是（）A的平方根是 3 B1的立方根是 1 C=1 D0 11（4 分）若代数式在实数范围内有意义，则x 的取值范围为（）Ax0 Bx 0 Cx 0 Dx 0 且 X 1 23（4 分）下列说法中正确的是（）A 4没有立方根B1的立方根是 1 C的立方根是D5 的立方根是24（4 分）在下列各式中：=，=0.1，=0.1，=27，其中正确的个数是（）A1B2C3D425（4 分）如果2（x2）3=6，则 x 等于（）ABC或D以上答案都不对26（4 分）如果a是（3）2的平方根，那么等于（）A 3 BC 3 D或2/12 27（4 分）若 x0，则等于（）AxB2x C0D2x 28（4 分）若 a2=（5）2，b3=（5）3，则 a+b 的值为（）A0B 10 C0 或 10 D0 或 10 29（4 分）如图，已知矩形ABOC 的边长 AB=2，OB=1，数轴上点A 表示的数为x，则 x213 的立方根是（）A13 B 13 C2D2 33（4 分）下列各组数中表示相同的一组是（）A 2与B2 与C2 与D2 与34（4 分）下列计算正确的是（）ABCD二、填空题（共18 小题，满分70 分）4（5 分）的立方根是_，125的立方根是_5（5 分）比较大小：（1）_；（2）_；（3）_；（4）_6（5 分）的平方根是_；的立方根是2，则 a=_7（5 分）若一个数的立方根等于这个数的算术平方根，则这个数是_12（5 分）的平方根是_13（5 分）（经典回放）当a0 时，可以化简为_14（5 分）若正方体的棱长为a，体积为8，根据正方体体积的公式得a3=8，那 a叫 8 的_，表示为_27 的立方根是_；0.008 的立方根是_，3 的立方根是_15（5 分）（2013?盐城）16 的平方根是_文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z33/12 16（5 分）（1999?山西）的立方根是_17（5 分）如果一个数的立方根等于它本身，那么这个数是_18（5 分）=_，（）3=_30（5 分）0.008 的立方根是_；的立方根是_；的立方根是_31（5 分）=_；=_；=_32（5 分）8 的立方根与4 的算术平方根的和是_2.3 立方根 2009年同步练习参考答案与试卷解读一、选择题（共16 小题，每小题4 分，满分64 分）1（4 分）下列说法正确的是（）A的立方根是 B的立方根是 C的立方根是D的立方根不存在考点：立方根分析：A、B、C、D 分别根据立方根的性质和概念即可判定解答：解：A、的立方根是，故选项错误；B、的立方根是，故选项错误C、的立方根是，故选项正确；D、的立方根是，故选项错误故选 C点评：本题主要考查了立方根的概念和性质概念：如果一个数x 的立方等于a，即 x 的三次方等于（x3=a），那么这个数x 就叫做 a 的立方根，也叫做三次方根立方根的性质：（1）正数的立方根是正数；（2）负数的立方根是负数；（3）0 的立方根是02（4 分）下列各式正确的有（）=0；=6；（）3=5；=a；（）3=a文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z34/12 A5 个B4个C3 个D2 个考点：立方根分析：根据算术平方根的定义即可判定；利用立方根的定义和性质分析求解即可判定解答：解：=0，故说法正确；=6，故说法正确；（）3=5，故说法错误；=a，故说法正确；（）3=a，故说法正确所以只有 错故选 B点评：主要考查了立方根的性质要求掌握立方根的性质：（1）正数的立方根是正数；（2）负数的立方根是负数；（3）0 的立方根是03（4 分）如果 b 是 a的立方根（ab 0），那么下列结论正确的是（）A b也是 a的立方根B b 是 a的立方根Cb 是 a的立方根D以上结论均不正确考点：立方根专题：计算题分析：根据立方根的定义，（b）3=a，则 b3=a，则 b3=a，即 b 是 a的立方根，由此即可判定选择项解答：解：b 是 a的立方根，即b=，=b 即 b 是 a的立方根故选 C点评：此题主要考查了立方根的定义，求一个数的立方根，应先找出所要求的这个数是哪一个数的立方由开立方和立方是互逆运算，用立方的方法求这个数的立方根注意一个数的立方根与原数的性质符号相同8（4 分）立方根等于本身的数是（）A 1 B0C 1 D 1 或 0 考点：立方根分析：根据立方根的定义得到立方根等于本身的数解答：解：立方根是它本身有3 个，分别是 1，0故选 D点评：本题主要考查了立方根的性质对于特殊的数字要记住，立方根是它本身有3个，分别是 1，0如立方根的性质：（1）正数的立方根是正数（2）负数的立方根是负数（3）0 的立方根是09（4 分）的平方根是（）A 4 B2C 2 D不存在考点：立方根；平方根分析：本题应先计算出的值，再根据平方根的定义即可求得平方根解答：解：（4）3=64 =4 又（2）2=4 4的平方根为 2故选 C点评：本题考查了平方根的定义注意一个正数有两个平方根，它们互为相反数；0 的平方根是0；负数没有平文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z35/12 方根10（4 分）下列说法正确的是（）A的平方根是 3 B1的立方根是 1 C=1 D0 考点：立方根专题：计算题分析：A、根据算术平方根、平方根的定义即可判定；B、根据立方根的定义即可判定C、根据算术平方根的定义即可判定；D、根据平方根的性质即可判定解答：解：A、=9，9 的平方根是 3，故选项正确；B、1 的立方根是它本身1，故选项错误；C、=1，故选项错误；D、当 x=0 时，=0，故选项错误故选 A点评：此题主要考查了立方根的定义，求一个数的立方根，应先找出所要求的这个数是哪一个数的立方由开立方和立方是互逆运算，用立方的方法求这个数的立方根注意：一个数的立方根与原数的性质符号相同二次根号是非负数，011（4 分）若代数式在实数范围内有意义，则x 的取值范围为（）Ax0 Bx 0 Cx 0 Dx 0 且 X 1 考点：立方根分析：根据分式的定义来解即分母不为0，由此即可得到x 的取值范围解答：解：分母不能等于0，0，即 x 0 故选 C点评：此题考查了立方根的性质，要知道任何数都有立方根，并且正数的立方根是正数，负数的立方根为负数，0 的立方根为023（4 分）下列说法中正确的是（）A 4没有立方根B1的立方根是 1 C的立方根是D5 的立方根是考点：立方根专题：计算题分析：A、根据立方根的定义即可判定；B、根据立方根的定义即可判定；C、根据立方根的定义即可判定；D、根据立方根的定义即可判定解答：解：A、4 有立方根为，故选项错误；B、1 的立方根是1，故选项错误；C、的平方根是，故选项错误；D、5 的立方根是，故选项正确故选 D点评：此题主要考查了立方根的性质：一个正数的立方根是正数，一个负数的立方根是负数，0 的立方根是0文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z36/12 24（4 分）在下列各式中：=，=0.1，=0.1，=27，其中正确的个数是（）A1B2C3D4考点：立方根专题：计算题分析：如果一个数x 的立方是a，那么 x 是 a的立方根，根据此定义分别计算即可判断正确个数解答：解：=，故正确；=0.1，故正确；0.1，故错误=（27）=27，=27，故错误正确的是第一个和第二个故选 B点评：此题主要考查了立方根定义，求一个数的立方根，应先找出所要求的这个数是哪一个数的立方由开立方和立方是互逆运算，用立方的方法求这个数的立方根注意一个数的立方根与原数的性质符号相同25（4 分）如果2（x2）3=6，则 x 等于（）ABC或D以上答案都不对考点：立方根分析：把（x2）看做是一个整体，利用开立方运算计算即可得到结果解答：解：2（x2）3=6（x2）3=，开立方得：x2=，解得：x=故选 B点评：本题主要考查了立方根的概念和运用定义解题的能力如果一个数x 的立方等于a，即 x 的三次方等于a（x3=a），那么这个数x 就叫做 a的立方根，也叫做三次方根读作“三次根号 a”其中，a叫做被开方数，3 叫做根指数26（4 分）如果a是（3）2的平方根，那么等于（）A 3 BC 3 D或考点：立方根；平方根分析：首先根据平方根的定义求出a，然后根据立方根的定义求解即可解答：解：a是（3）2的平方根，a=3，而 3 的立方根是，3的立方根是，等于或故选 D点评：此题主要考查了平方根、立方根的定义，首先根据平方根的定义求出a的值，然后利用根据立方根的定义求解注意一个数的立方根与原数的性质符号相同文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z37/12 27（4 分）若 x0，则等于（）AxB2x C0D2x 考点：立方根分析：分别利用平方根、立方根的定义求解即可解答：解：x 0，=xx=2x故答案 D点评：本题主要考查了平方根和立方根的性质，并利用此性质解题平方根的被开数不能是负数，开方的结果必须是非负数；立方根的符号与被开立方的数的符号相同本题易在符号的正负上弄错，要严格按照性质解题28（4 分）若 a2=（5）2，b3=（5）3，则 a+b 的值为（）A0B 10 C0 或 10 D0 或 10 考点：立方根；平方根分析：先根据平方根、立方根的定义分别求出a，b 的值，然后即可求a+b 的值解答：解：因为a2=（5）2=25，b3=（5）3，所以 a=5，b=5，则 a+b 的值为 55=0 或 55=10 故选 D点评：主要考查了平方根和立方根的概念一般情况下一个数的平方根有2 个，它们互为相反数；立方根只有一个29（4 分）如图，已知矩形ABOC 的边长 AB=2，OB=1，数轴上点A 表示的数为x，则 x213 的立方根是（）A13 B 13 C2D2 考点：立方根；实数与数轴；勾股定理分析：先将原式x213 变形为 x249，整体求出x24 的值，然后根据立方根的定义来解答解答：解：根据勾股定理x222=12，即 x222=1，x213=x2 49=19=8，则 x213 的立方根是=2故选 D点评：本题综合性较强，不仅要结合图形，还需要熟悉勾股定理和立方根的定义33（4 分）下列各组数中表示相同的一组是（）A 2与B2 与C2 与D2 与考点：立方根分析：A、根据算术平方根的性质化简即可判定；B、根据立方根的性质化简即可判定；C、根据倒数定义即可判定；D、根据算术平方根的定义求解即可解答：解：A、=2，故选项错误B、2的立方等于8，8 的立方根等于2，2 与相同，故选项正确；文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档编码:CL6Z3O8F4X7 HG10T2P1I3U7 ZK1X6Z5S10Z3文档