试题与答案

下列各式的运算中正确的是（ ） A．4=±2 B．(-5)2=-5 C．(±3)2=3

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题型：选择题

题目：

下列各式的运算中正确的是（　　）
A．
4
=±2		B．
(-5)2
=-5		C．(±
3
)2=3		D．
-9
=-3

答案：

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考点：算术平方根
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