Question

Ai giúp mik với

Answer 1

a,\(\dfrac{x}{2}=\dfrac{5}{8}\Rightarrow x=2,25\)

 

Answer 2

b,\(\dfrac{7}{2}\)

 hoặc \(\dfrac{-9}{2}\)

Answer 3

a) \(\Rightarrow x=\dfrac{2.5}{8}=\dfrac{10}{8}=\dfrac{5}{4}\)

b) \(\Rightarrow\left|x+\dfrac{1}{2}\right|=7-3=4\)

\(\Rightarrow\left[{}\begin{matrix}x+\dfrac{1}{2}=4\\x+\dfrac{1}{2}=-4\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{7}{2}\\x=-\dfrac{9}{2}\end{matrix}\right.\)

c) \(\Rightarrow\dfrac{5}{3}x=-\dfrac{1}{3}+\dfrac{2}{3}=\dfrac{1}{3}\Rightarrow x=\dfrac{1}{3}:\dfrac{5}{3}=\dfrac{1}{5}\)