Question

Tìm x

a) 3. |x - 2| = 3

b) |2x + 3| =5

c) 2-x=17-(-5)

d) 8-| x+3| = 16:2³

Giúp mình nhé vội lắm

Answer 1

b, \(\left|2x+3\right|=5\)

\(\Rightarrow\left[\begin{matrix}2x+3=5\\2x+3=-5\end{matrix}\right.\Rightarrow\left[\begin{matrix}2x=2\\2x=-8\end{matrix}\right.\Rightarrow\left[\begin{matrix}x=1\\x=-4\end{matrix}\right.\)

Vậy, x = 1 hoặc x = -4.

Answer 2

c, \(2-x=17-\left(-5\right)\)

\(\Rightarrow2-x=17+5\)

\(\Rightarrow2-x=22\)

\(\Rightarrow x=2-22\)

\(\Rightarrow x=-20\)

Answer 3

https://hoc24.vn/hoi-dap/question/181523.html

Answer 4

a, \(3\left|x-2\right|=3\)

\(\Rightarrow\left|x-2\right|=1\)

\(\Rightarrow\left|x\right|=3\)

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

Vậy, x = 3 hoặc x = -3.

Answer 5

a. 3.|x-2|=3

|x-2|=1

=> x-2 = 1 hay x-2 = -1

=> x=3 hay x=1

Vậy x=3;x=1

b. |2x+3|=5

=> 2x+3=5 hay 2x+3=-5

=> 2x = 2 hay 2x = -8

=> x=1 hay x=-4

Vậy x=1;x=-4

c. 2-x=17-(-5)

2-x = 22

x= -20

Vậy x=-20

d. 8-|x+3|=16:2³

8-|x+3|=2

|x+3|=4

=> x+3=4 hay x+3=-4

=> x = 1 hay x = -7

Vậy x=1;x=-7

Answer 6

d, \(8-\left|x+3\right|=\frac{16}{2^3}\)

\(\Rightarrow8-\left|x+3\right|=\frac{2^4}{2^3}\)

\(\Rightarrow8-\left|x+3\right|=2\)

\(\Rightarrow\left|x+3\right|=6\)

\(\Rightarrow\left[\begin{matrix}x+3=6\\x+3=-6\end{matrix}\right.\Rightarrow\left[\begin{matrix}x=3\\x=-9\end{matrix}\right.\)

Vậy, x = 3 hoặc x = -9.

Answer 7

a) 3.|x-2|=3

=> |x-2|=3:3

=> |x-2|= 1

=> |x|=1+2

=> |x|=3

=> x =3

b) |2x+3|=5

TH1:|2x+3|=5

=> |2x|=5-3

=> |2x|= 2

=> |x|=2:2

=> |x|=1

=> x=1

TH2: |2x+3|=-5

=> |2x| =(-5)-3

=> |2x| =-8

=> |x| =(-8):2

=> |x|= -4

=> x=-4

c) 2-x=17-(-5)

=> 2-x=22

=> x= 2-22

=> x=-20