Question

2./x-20/=10

Answer 1

\(2.\left|x-20\right|=10\)

\(\left|x-20\right|=10\div2\)

\(\left|x-20\right|=5\)

\(\Rightarrow\left[\begin{matrix}x-20=5\\x-20=-5\end{matrix}\right.\)

\(\Rightarrow\left[\begin{matrix}x=20+5\\x=20+\left(-5\right)\end{matrix}\right.\)

\(\Rightarrow\left[\begin{matrix}x=25\\x=15\end{matrix}\right.\)

Vậy \(x=\left\{25;15\right\}\)

Answer 2

/x-20/=10:2

/x-20/=5 hoặc /x-20/=-5

TH1: /x-20/=5

x=5+20

x=25

TH2: /x-20/=-5

x=-5+20

x=15

Vậy x=25

x=15

Answer 3

Ta có :

2.|x - 20| = 10

\(\Rightarrow\) |x - 20| = 5

\(\Rightarrow\) x - 20 = 5 hoặc x - 20 = -5

. Trường hợp 1 :

x - 20 = 5

x = 5 + 20

x = 25

. Trường hợp 2 :

x - 20 = -5

x = -5 + 20

x = 15

Vậy x \(\in\) { 15; 20 }

Answer 4

25;15