Question

/2.5-x/=7.5

1.6-/x-0.2/=0

/x-1.8/+12.7-x=0

giúp mình nhé

Answer 1

\(\left|2,5-x\right|=7,5\)

\(\orbr{\begin{cases}2,5-x=7,5\\2,5-x=-7,5\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=2,5-7,5\\x=2,5+7,5\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=-5\\x=10\end{cases}}\)

\(Vayx\in\left\{-5;10\right\}\)

Answer 2

\(1,6-\left|x-0,2\right|=0\)

\(\left|x-0,2\right|=1,6\)

\(\orbr{\begin{cases}x-0,2=1,6\\x-0,2=-1,6\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=1,6+0,2\\x=-1,6+0,2\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=1,8\\x=-1,4\end{cases}}\)