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

Toán Lớp 9: giải hệ pt +)x+2y=căn2 +)3x-y=căn200

Toán Lớp 9: giải hệ pt
+)x+2y=căn2
+)3x-y=căn200

Comments ( 1 )

  1. $\begin{cases}x+2y=\sqrt 2\\3x-y=\sqrt{200}\end{cases}\\↔\begin{cases}3x+6y=3\sqrt 2\\3x-y=10\sqrt 2\end{cases}\\↔\begin{cases}3x-y+7y=3\sqrt 2\\3x-y=10\sqrt 2\end{cases}\\↔\begin{cases}10\sqrt 2+7y=3\sqrt 2\\3x-y=10\sqrt 2\end{cases}\\↔\begin{cases}7y=-7\sqrt 2\\3x-y=10\sqrt 2\end{cases}\\↔\begin{cases}y=-\sqrt 2\\3x-y=10\sqrt 2\end{cases}\\↔\begin{cases}y=-\sqrt 2\\3x+\sqrt 2=10\sqrt 2\end{cases}\\↔\begin{cases}y=-\sqrt 2\\3x=9\sqrt 2\end{cases}\\↔\begin{cases}y=-\sqrt 2\\x=3\sqrt 2\end{cases}$
    Vậy hệ phương trình có nghiệm $(x;y)=(3\sqrt 2;-\sqrt 2)$
     

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

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