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

Toán Lớp 7: Tìm x: a) x – 2 $\sqrt{x}$ = 0 b) x = $\sqrt{x}$

Toán Lớp 7: Tìm x:
a) x – 2 $\sqrt{x}$ = 0
b) x = $\sqrt{x}$

Comments ( 1 )

  1. ${a)x-2\sqrt[]{x}=0}$                ${ĐKXĐ:x\geq0}$
    ${⇔\sqrt[]{x}(\sqrt[]{x}-2=0)}$
    ${⇔\left[\begin{matrix} \sqrt[]{x}=0\\ \sqrt[]{x}-2=0\end{matrix}\right.}$
    ${⇔\left[\begin{matrix} x=0\\ \sqrt[]{x}=2\end{matrix}\right.}$
    ${⇔\left[\begin{matrix} x=0,tm\\ x=4,tm\end{matrix}\right.}$
    Vậy ${x=0}$ hoặc ${x=4}$
    ${x=\sqrt[]{x}}$                        ${ĐKXĐ:x\geq0 }$
    ${⇔x-\sqrt[]{x}=0}$
    ${⇔\sqrt[]{x}(\sqrt[]{x}-1)=0}$
    ${⇔\left[\begin{matrix} \sqrt[]{x}=0\\ \sqrt[]{x}-1=0\end{matrix}\right.}$
    ${⇔\left[\begin{matrix} x=0\\ \sqrt[]{x}=1\end{matrix}\right.}$
    ${⇔\left[\begin{matrix} x=0,tm\\ x=1,tm\end{matrix}\right.}$
    Vậy ${x=0}$ hoặc ${x=1}$
     

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

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