Question

tìm x biết

Answer 1

|2.5-x|=1.3

Ta có thể chia thành 2 trường hợp:

*2.5-x=1.3

x= 2.5-1.3=1.2

*2.5-x= -1.3

x= 2.5 -(-1.3)=3.8

Vậy x € {1.2;3.8}

Answer 2

Tìm x biết:
\(\left|2,5-x\right|=1,3\)
\(\Rightarrow\left\{{}\begin{matrix}2,5-x=1,3\\2,5-x=-1,3\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}-x=1,3-2,5\\-x=-1,3-2,5\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}-x=-1,2\\-x=-3,8\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=1,2\\x=3,8\end{matrix}\right.\)
Vậy... \(x=1,2\) hoặc \(x=3,8\)