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

Toán Lớp 9: giải hpt bằng pp cộng đại số `{(x\sqrt{2}-3y=1),(2x+y\sqrt{2}=-2):}`

Toán Lớp 9: giải hpt bằng pp cộng đại số
{(x\sqrt{2}-3y=1),(2x+y\sqrt{2}=-2):}

Comments ( 1 )

  1. \(\left\{ \begin{array}{l}x\sqrt{2}-3y=1\\2x+y\sqrt{2}=-2\end{array} \right.\) 
    $⇔$\(\left\{ \begin{array}{l}x\sqrt{2}-3y=1\\-x\sqrt{2}-y=\sqrt{2}\end{array} \right.\) 
    $⇔$\(\left\{ \begin{array}{l}x\sqrt{2}-3y=1\\-4y=\sqrt{2}+1\end{array} \right.\) 
    $⇔$\(\left\{ \begin{array}{l}x\sqrt{2}-3y=1\\y=\dfrac{-\sqrt{2}-1}{4}\end{array} \right.\)
    $⇔$\(\left\{ \begin{array}{l}x\sqrt{2}-3.\dfrac{-\sqrt{2}-1}{4}=1\\y=\dfrac{-\sqrt{2}-1}{4}\end{array} \right.\)
    $⇔$\(\left\{ \begin{array}{l}x=\dfrac{-6+\sqrt{2}}{8}\\y=\dfrac{-\sqrt{2}-1}{4}\end{array} \right.\) 

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

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