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> 49的平方根为()A.7B.C.±7D.±-八年级数学
49的平方根为()A.7B.C.±7D.±-八年级数学
题目简介
49的平方根为()A.7B.C.±7D.±-八年级数学
题目详情
49的平方根为( )
A.7
B.
C.±7
D.±
题型:单选题
难度:中档
来源:不详
答案
C
首先根据平方根的定义,根据平方根的定义得出±7的平方等于49,然后就可以解决问题.
解:∵±7的平方等于49,
∴49的平方根为±7.
故选C.
此题主要考查了平方根的定义和性质,根据平方的方法求这个数的平方根.注意一个正数的平方根有两个.
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题目简介
49的平方根为()A.7B.C.±7D.±-八年级数学
题目详情
答案
解:∵±7的平方等于49,
∴49的平方根为±7.
故选C.
此题主要考查了平方根的定义和性质,根据平方的方法求这个数的平方根.注意一个正数的平方根有两个.