Question

a) 3.x -2=7

b) 5.x+4=(-3)+17

C) 22-2.x =4¹́5:4¹³

Answer 1

\(a,3x-2=7.\)

\(3x=7+2.\)

\(3x=9.\)

\(x=\dfrac{9}{3}=3\in N.\)

Vậy.....

\(b,5x+4=\left(-3\right)+17.\)

\(5x+4=14.\)

\(5x=14-4.\)

\(5x=10.\)

\(x=\dfrac{10}{5}=2\in N.\)

Vậy.....

\(c,22-2x=4^{15}:4^{13}.\)

\(22-2x=16.\)

\(2x=22-16.\)

\(2x=6.\)

\(x=\dfrac{6}{2}=3\in N.\)

Vậy.....

Answer 2

a/ 3.x-2=7

3.x=7+2

3.x=9

x=9:3

x=3

Vậy x=3

b/5.x+4=(-3)+17

5.x+4=14

5.x=14-4

5.x=10

x=10:5

x=2

c/22-2.x=4¹⁵:4¹³

22-2.x=4^15-13

22-2.x=4²

22-2.x=16

2.x=22-16

2.x=6

x=6:2

x=3