Question

tìm số nguyên x

/ x + 9 / . 2 = 10

Answer 1

\(\left|x+9\right|.2=10\)

\(\Rightarrow\left|x+9\right|=10:2\)

\(\Rightarrow\left|x+9\right|=5\)

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

\(\Rightarrow\left[\begin{matrix}x=5-9\\x=\left(-5\right)-9\end{matrix}\right.\)

\(\Rightarrow\left[\begin{matrix}x=-4\\x=-14\end{matrix}\right.\)

Vậy \(\left[\begin{matrix}x=-4\\x=-14\end{matrix}\right.\)

Answer 2

\(\left|x+9\right|.2=10\)

\(\left|x+9\right|=10:2\)

\(\left|x+9\right|=5\)

\(\Rightarrow\left[\begin{matrix}x+9=5\\x+9=-5\end{matrix}\right.\Rightarrow\left[\begin{matrix}x=-4\\x=-14\end{matrix}\right.\)

Answer 3

| x + 9 | . 2 = 10

| x + 9 | = 10 : 2

| x + 9 | = 5

\(\Rightarrow\left\{\begin{matrix}x+9=5\\x+9=-5\end{matrix}\right.\Leftrightarrow\left\{\begin{matrix}x=-4\\x=-14\end{matrix}\right.\)

Vậy x thuộc { - 4 ; - 14 }

Answer 4

sao ban ko tim tren may tinh