忘记了密码?新用户?<一个href="//www.parkandroid.com/account/signup/?signup=true&next=/problems/just-take-the-average-right/%26topic_tag%3Dalgebra" id="problem-signup-link-alternative" class="btn-link ax-click" data-ax-id="clicked_signup_from_generic_modal" data-ax-type="button" data-next="/problems/just-take-the-average-right/%26topic_tag%3Dalgebra">报名
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让 一个 一个 一个和 b b b明确非否定<一个href="//www.parkandroid.com/wiki/integers/" class="wiki_link" title="整数" target="_blank">整数,让 x = 一个 2 + b 2 2 x = \压裂{b ^ ^ 2 + 2} {2} x=2一个2+b2.
下面哪个陈述是正确的 x \ sqrt {x} x ?
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