720:[41-(2x-5)]=2³.5

720:[41-(2x-5)]=8.5

720:[41-(2x-5)]=40

41-(2x-5)=720:40

41-(2x-5)=18

2x-5=41-18

2x-5=23

2x=23+5

2x=28

x=28:2

x=14

Vậy x=14

720:[41-(2x-5)]=2^3.5

720:[41-2x+5]=40

[41+5-2x]=720:40

46-2x=18

2x=46-18

2x=28

x=14

720:[41-(2x - 5)]=2³.5

 720:[41-(2x - 5)]=8.5

 720:[41-(2x - 5)]=40

        41-(2x - 5)=720:40

        41-(2x - 5)=18

       2x - 5=41-18

       2x - 5=23

        2.x=23+5

        2.x=28

        x=28:2

        x=14

720 : [41 - (2x -5)] = 2^3 * 5

41 - (2x -5) = 18 

2x - 5 = 23 

2x = 28 

x= 14

720 : [ 41 - ( 2x - 5 ) ] = 2³ . 5

720 : [ 41 - ( 2x - 5 ) ] = 8 . 5

720 : [ 41 - ( 2x - 5 ) ] = 40

41 - ( 2x - 5 ) = 720 : 40

41 - ( 2x - 5 ) = 18

2x - 5 = 41 - 18

2x - 5 = 23

2x = 23 + 5

2x = 28

=> x = 28 : 2

=> x = 14

720 : [ 41 - ( 2 x - 5 ) ] = 40

          41 - ( 2 x - 5 )   = 720 : 40

          41 - ( 2 x - 5 )   = 18

                   2 x - 5     = 41 - 18

                   2 x - 5     = 23

                   2 x          = 23 + 5

                   2 x          = 28

                      x          = 28 : 2

                      x          = 14

a: Sửa đề: (2x-4)(3-x)=0

=>\(\left[\begin{array}{l}2x-4=0\\ 3-x=0\end{array}\right.\Rightarrow\left[\begin{array}{l}2x=4\\ x=3\end{array}\right.\Rightarrow\left[\begin{array}{l}x=2\\ x=3\end{array}\right.\)

b: \(720:\left\lbrack41-\left(2x-5\right)\right\rbrack=2^2\cdot5\)

=>\(720:\left(41-2x+5\right)=4\cdot5=20\)

=>720:(46-2x)=20

=>46-2x=720:20=36

=>2x=46-36=10

=>x=5

c: 15-x=7-(-2)

=>15-x=7+2

=>15-x=9

=>x=15-9=6

(2x - 4)³ = 8

(2x - 4)³ = 2³

2x - 4 = 2

2x = 2 + 4

2x = 6

x = 6 : 2

x = 3

\(\frac{720}{41-\left(2x-5\right)}=2^3\times5\)

\(\frac{720}{41-2x+5}=8\times5\)

\(46-2x=\frac{720}{40}\)

\(2x=46-18\)

2x = 28

x = 28 : 2

x = 14

\(\Leftrightarrow41-2x+5=720:20=36\)

=>-2x=0

hay x=0