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

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

=> 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 = 18 

<=> 2x - 5 = 41 -18 = 23

<=> 2x = 23+5 =28

=> x = 28 : 2 =14

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

\(720:\left[41-2x+5\right]=8.5=40\)

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

\(41-2x+5=18\)

\(2x+5=23\)

\(2x=18\)

\(x=9\)

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

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

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

\(41-\left(2x-5\right)=720:40\)

\(41- \left(2x-5\right)=18\)

\(2x-5=41-18\)

\(2x-5=23\)

\(2x=23+5\)

\(2x=28\)

\(x=28:2\)

\(\Rightarrow x=14\)

kết quả =18 và 14

18 vaf14 

\(720:\left[41-\left(2x-5\right)\right]=2^3\times5\)

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

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

                                       \(2x=23+5\)

                                          \(x=28:2\)

                                          \(x=14\)

Cách làm 

Bài 1:     25 + 3(x - 8) = 106

                      3(x - 8) = 106 - 25

                      3(x - 8) = 81

                        (x - 8) = 81 : 3

                        (x - 8) = 27

                                x = 27 + 8

                                x = 25

Bài 2:       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-(2x-5))         =2\(^3\)x5

720:(41-(2x-5))         =40

41-(2x-5)                 =720:40=18

2x-5                        =41-18=23

2x                           =23+5=28

=> x                       =28:2=14

x=14

k nha.đúng 100%  đó

x =9nha bạn

k nha

bạn ơi bạn có thể giải cụ thể cho mình được ko

a, \(3^2\left(x+14\right)-5^2=5.4\)

\(\Rightarrow9\left(x+14\right)-25=20\)

\(\Rightarrow9x+126=20+25\)

\(\Rightarrow9x+126=45\)

\(\Rightarrow9x=45-126\)

\(\Rightarrow9x=-81\Rightarrow x=-9\)

Vậy x = 9 

a,\(3^2\left(x+14\right)-5^2=5.4\)

\(\Rightarrow9\left(x-14\right)-25=20\)

\(\Rightarrow9\left(x-14\right)=20+25=45\)

\(\Rightarrow x-14=45:9=5\)

\(\Rightarrow x=5+14\)

\(\Rightarrow x=19\)

Vậy x = 19

b,\(720:\left[41-\left(2x-5\right)\right]=2^3.5\)

\(720:\left[41-2x+5\right]=40\)

\(\Rightarrow41+5-2x=720:40\)

\(\Rightarrow46-2x=18\)

\(\Rightarrow2x=46-18=28\)

\(\Rightarrow x=28:2\)

\(\Rightarrow x=14\)

Vậy x = 14

~Study well~

b, \(720\div\left[41-\left(2x-5\right)\right]=2^3.5\)

\(\Rightarrow720\div\left[41-\left(2x-5\right)\right]=8.5\)

\(\Rightarrow720\div\left[41-\left(2x-5\right)\right]=40\)

\(\Rightarrow41-\left(2x-5\right)=\frac{720}{40}\)

\(\Rightarrow41-\left(2x-5\right)=18\)

\(\Rightarrow2x-5=41-18\)

\(\Rightarrow2x-5=23\)

\(\Rightarrow2x=23+5\)

\(\Rightarrow2x=28\Rightarrow x=\frac{28}{2}=14\)

Vậy x = 14 

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

\(\Leftrightarrow720:\left[41-\left(2x-5\right)\right]=40\)

\(\Leftrightarrow41-\left(2x-5\right)=720:40\)

\(\Leftrightarrow41-\left(2x-5\right)=18\)

\(\Leftrightarrow2x-5=41-18\)

\(\Leftrightarrow2x-5=23\)

\(\Leftrightarrow2x=28\)

\(\Leftrightarrow x=14\)

Ta có :\(720:\left[41-\left(2X-5\right)\right]=2^3\cdot5\)

\(\Leftrightarrow41-\left(2X-5\right)=18\)

\(\Leftrightarrow2X-5=23\)

\(\Leftrightarrow2X=28\)

\(\Leftrightarrow X=14\)(TMĐK)

Vậy X= 14 là giá trụ cần tìm.

[X-1]^3=125

[x-1]^3=5^3

x-1=5

x=5+1

x=6

Vậy x=6

a) \(\left(x-1\right)^3=125\)

\(\Rightarrow x-1=5\)

\(\Rightarrow x=6\)

b) \(2^{x+2}-2^x=96\)

\(\Rightarrow2^x.2^2-2^x=96\)

\(\Rightarrow2^x.3=96\)

\(\Rightarrow2^x=32=2^5\)

\(\Rightarrow x=5\)

c) \(\left(2x+1\right)^3=343=7^3\)

\(\Rightarrow2x+1=7\)

\(\Rightarrow x=3\)

\(\left(x-1\right)^3=125\)\(\Rightarrow\left(x-1\right)^3=5^3\Rightarrow x-1=5\)

\(\Rightarrow x=5+1=6\)

\(\left(2x+1\right)^3=343\Rightarrow\left(2x+1\right)^3=7^3\Rightarrow2x+1=7\)

\(2x=7-1=6\Rightarrow x=6:2=3\)

\(720:\left[41-\left(2x-5\right)\right]=120\)

\(\Leftrightarrow41-\left(2x-5\right)=6\)

\(\Leftrightarrow2x-5=35\)

\(\Leftrightarrow2x=40\)

\(\Leftrightarrow x=20\)

hok tốt!

720 : [ 41 - ( 2x - 5 ) ] = 120
           41 - ( 2x - 5 ) ] = 720 : 120 = 6
                     2x - 5     =    41 - 6    = 35
                     2x          =    35 + 5   = 40
                       x          =     40 : 2   = 20
 Học tốt

720 : [ 41 - ( 2x - 5 ) ] = 120

=> 41 - ( 2x - 5 ) = 720 : 120

=> 41 - ( 2x - 5 ) = 6

=> 2x - 5 = 41 - 6 

=> 2x - 5 = 35

=> 2x = 35 + 5

=> 2x = 40

=> x = 40 : 2

=> x = 20

Vậy x = 20