Question

1. tìm x

a. 17.x=-12

b. -x-|-5|=18

c. |x-5|=|-6|

d. (x+19).(x-3)=0

Answer 1

a. \(17.x=-12\)

\(\Rightarrow x=\dfrac{-12}{17}\)

Vậy..........

b. \(-x-\left|-5\right|=18\)

\(\Rightarrow-x-5=18\)

\(\Rightarrow-x=18+5=23\)

\(\Rightarrow x=-23\)

Vậy..........

c. \(\left|x-5\right|=\left|-6\right|\)

\(\Rightarrow\left[{}\begin{matrix}x-5=6\\x-5=-6\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=11\\x=-1\end{matrix}\right.\)

Vậy..........

d. \(\left(x+19\right).\left(x-3\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}x+19=0\\x-3=0\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=-19\\x=3\end{matrix}\right.\)

Vậy..........