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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: √( √5 – 2)^2)= căn mỗi số 5 thôi nhé

Toán Lớp 8: √( √5 – 2)^2)=
căn mỗi số 5 thôi nhé

Comments ( 2 )

  1. \sqrt{(\sqrt{5}-2)^2}
    =|\sqrt{5}-2|
    =\sqrt{5}-2 (vì \sqrt{5}-2>0)
     

  2. $\sqrt{(\sqrt{5}-2)^2}$=|$\sqrt{5}$-2|
    Vì 5>4 => $\sqrt{5}$>$\sqrt{4}$
    => $\sqrt{5}$>2
    => $\sqrt{5}$-2>0
    => |$\sqrt{5}$-2|=$\sqrt{5}$-2
    => $\sqrt{(\sqrt{5}-2)^2}$=$\sqrt{5}$-2

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222-9+11+12:2*14+14 = ? ( )