Question

tìm x biết

 

Answer 1

a)\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{3}{8}\\x=-\dfrac{3}{8}\end{matrix}\right.\)

b)\(\Rightarrow\left|x+5\right|=\dfrac{1}{3}+\dfrac{1}{9}=\dfrac{4}{9}\)

   \(\Rightarrow\left[{}\begin{matrix}x+5=\dfrac{4}{9}\\x+5=-\dfrac{4}{9}\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=-\dfrac{41}{9}\\x=-\dfrac{49}{9}\end{matrix}\right.\)

Answer 2

a)⇒|x+5|=13+19=49⇒|x+5|=13+19=49

   ⇒⎡⎢ ⎢⎣x=−419x=−499