Toán Lớp 7: 100 trừ /x+1/=90
giúp vs ạ
dấu gạch ấy là gạch thẳng xuống
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Toán Lớp 7: 100 trừ /x+1/=90
giúp vs ạ
dấu gạch ấy là gạch thẳng xuống
Comments ( 2 )
100{\rm{ }}\left| {x + 1} \right| = 90\\
\Rightarrow \left| {x + 1} \right| = 100 – 90\\
\Rightarrow |x + 1| = 10\\
\Rightarrow \left[ \begin{array}{l}
x + 1 = 10\\
x + 1 = – 10
\end{array} \right. \Rightarrow \left[ \begin{array}{l}
x = 9\\
x = – 11
\end{array} \right.
\end{array}\]