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> x是的平方根,y是64的立方根,则x+y的值为()A.3B.7C.3,7D.1,7-八年级数学
x是的平方根,y是64的立方根,则x+y的值为()A.3B.7C.3,7D.1,7-八年级数学
题目简介
x是的平方根,y是64的立方根,则x+y的值为()A.3B.7C.3,7D.1,7-八年级数学
题目详情
x
是
的平方根,y是64的立方根,则
x
+
y
的值为( )
A.3
B.7
C.3,7
D.1,7
题型:单选题
难度:偏易
来源:不详
答案
D
考点:
分析:分别利用平方根、立方根的定义求解即可.
解答:解:∵
=9,
∴3和-3是9的平方根,,即x=3或者x=-3
∵4是64的立方根,∴y=4.
则x+y的值为7或者1
答案:D,
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;负数没有平方根.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.
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题目简介
x是的平方根,y是64的立方根,则x+y的值为()A.3B.7C.3,7D.1,7-八年级数学
题目详情
答案
分析:分别利用平方根、立方根的定义求解即可.
解答:解:∵
∴3和-3是9的平方根,,即x=3或者x=-3
∵4是64的立方根,∴y=4.
则x+y的值为7或者1
答案:D,
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;负数没有平方根.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.