共50条信息
下列说法:\(①π\)的相反数是\(-π\);\(②\)若\(\left| x \right|=\sqrt{6}\),则\(x=\sqrt{6}\);\(③\)若\(a\)为实数,则\(a\)的倒数是\(\dfrac{1}{a}\);\(④\)若\(\sqrt{{{x}^{2}}}=-x\),则\(x < 0.\)其中正确的有\((\) \()\)
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