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> 下列说法正确的是()A.任意数a的平方根有2个,它们互为相反数B.任意数a的立方根有1个C.-3是27的负的立方根D.(-1)的立方根是-1-八年级数学
下列说法正确的是()A.任意数a的平方根有2个,它们互为相反数B.任意数a的立方根有1个C.-3是27的负的立方根D.(-1)的立方根是-1-八年级数学
题目简介
下列说法正确的是()A.任意数a的平方根有2个,它们互为相反数B.任意数a的立方根有1个C.-3是27的负的立方根D.(-1)的立方根是-1-八年级数学
题目详情
下列说法正确的是( )
A.任意数a的平方根有2个,它们互为相反数
B.任意数a的立方根有1个
C.-3是27的负的立方根
D.(-1)
的立方根是-1
题型:单选题
难度:偏易
来源:不详
答案
B
分析:根据立方根和平方根的知识点进行解答,一个正数有两个平方根,它们互为相反数;0的平方根是0;负数没有平方根,任何实数都有立方根.
解:A、一个正数有两个平方根,它们互为相反数;0的平方根是0;负数没有平方根,故本选项错误,
B、任何实数都有立方根且有一个.本选项正确,
C、27的立方根是3,本选项错误,
D、(-1)
=1,它的立方根是它本身1,本选项错误,
故选B.
点评:本题主要考查立方根和平方根的知识点,基础题,比较简单,需要同学们牢固掌握.
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下列等式成立的是()A.B.C.D.-九年级
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题目简介
下列说法正确的是()A.任意数a的平方根有2个,它们互为相反数B.任意数a的立方根有1个C.-3是27的负的立方根D.(-1)的立方根是-1-八年级数学
题目详情
答案
解:A、一个正数有两个平方根,它们互为相反数;0的平方根是0;负数没有平方根,故本选项错误,
B、任何实数都有立方根且有一个.本选项正确,
C、27的立方根是3,本选项错误,
D、(-1)
故选B.
点评:本题主要考查立方根和平方根的知识点,基础题,比较简单,需要同学们牢固掌握.