Làm giúp em vs nha !

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1. `|5.(2x+3)| + |2.(2x+3)| + |2x+3| =16`

   `⇒ |2x+3| . (5+2+1) = 16`

   `⇒ |2x+3| . 8 = 16`

   `⇒ |2x+3|=16`

   `⇒` $\left[ \begin{array}{l}2x+3=2\\2x+3=-2\end{array} \right.$

   `⇒` $\left[ \begin{array}{l}2x=2-3\\2x=-2-3\end{array} \right.$

   `⇒` $\left[ \begin{array}{l}2x=-1\\2x=-5\end{array} \right.$

   `⇒` $\left[ \begin{array}{l}x=-\dfrac{1}{2} \\x=-\dfrac{5}{2} \end{array} \right.$

   Vậy `x=-1/2` hoặc `x=-5/2`

   Xin hay nhất !

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2. $|5.(2x+3)| + |2.(2x+3)| + |2x+3| =16$

   $⇔ |2x+3| . (5+2+1) = 16$

   $⇔ |2x+3| . 8 = 16$

   $⇔ |2x+3| = 2$

   ⇔ \(\left[ \begin{array}{l}2x+3=2\\2x+3=-2\end{array} \right.\)

   ⇔ \(\left[ \begin{array}{l}2x=-1\\2x=-5\end{array} \right.\) 

   ⇔ \(\left[ \begin{array}{l}x=\frac{-1}{2} \\x=\frac{-5}{2} \end{array} \right.\) 

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