Toán Lớp 7: l2+3x l – l4x-3 l giups em caanf gaaps
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Toán Lớp 7: l2+3x l – l4x-3 l giups em caanf gaaps
Comments ( 1 )
\left| {2 + 3x} \right| = \left| {4x – 3} \right|\\
\Leftrightarrow \left[ \begin{array}{l}
2 + 3x = 4x – 3\\
2 + 3x = 3 – 4x
\end{array} \right.\\
\Leftrightarrow \left[ \begin{array}{l}
x = 5\\
7x = 1
\end{array} \right.\\
\Leftrightarrow \left[ \begin{array}{l}
x = 5\\
x = \dfrac{1}{7}
\end{array} \right.\\
Vậy\,x = 5;x = \dfrac{1}{7}
\end{array}$