a) 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

b) x+(x+1)+(x+2)+......+(x+30)=1240

x+x+1+x+2+...+x+30=1240

(x+x+x+....+x) + (1+2+3+....30)=1240

31*x + \(\frac{\left(30+1\right)\cdot30}{2}\)=1240

31*x + 465 =1240

31*x=1240-465

31*x =775

x = 775:31

x=25

tick mình nhé 

CHTT nha bạn ! 

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

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

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

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

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

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

\(2x-5=23\)

\(2x=23+5\)

\(2x=28\)

\(x=28:2\)

\(\Rightarrow x=14\)

kết quả =18 và 14

18 vaf14 

a, vì : 3² = 9

=> x - 6 = 3

=>     x  = 9

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

   41 - ( 2x - 5 )              = 720 : 40 = 18

            2x - 5                = 41 - 18 = 23

                  2x               = 23 + 5 = 28

                    x               = 28  :  2 = 14

c, ( 4x + 28 ) . 3 + 55  = 35 . 5 = 175

           ( 4x + 28 ) . 3  = 175 - 55 = 120

                  4x + 28    = 120 : 3 = 40

                            4x  = 40 - 28 = 12

                               x = 12 : 4 = 3 

**** GIÙM MK NHA , TKS 

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

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

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

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

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

\(\Leftrightarrow2x-5=23\)

\(\Leftrightarrow2x=28\)

\(\Leftrightarrow x=14\)

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.

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

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

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 

(x - 1)³ = 125

=> (x - 1)³ = 5³

=> x - 1 = 5

=> x = 5 + 1

=> x = 6

(2x + 1)³ = 343

=> (2x + 1)³ = 7³

=> 2x + 1 = 7

=> 2x = 7 - 1

=> 2x = 6

=>  x = 3

720 : [41 - (2x - 5)] = 2³.5

=> 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 = 14

a) \(\left(x-1\right)^3=125\)
\(\Rightarrow\left(x-1\right)^3=5^3\)
\(\Rightarrow x-1=5\)
\(\Rightarrow x=5+1=6\)
b) \(\left(2\cdot x+1\right)^3=343\)
\(\Rightarrow\left(2\cdot x+1\right)^3=7^3\)
\(\Rightarrow2\cdot x+1=7\)

\(\Rightarrow2\cdot x=7-1\)

\(\Rightarrow2\cdot x=6\)
\(\Rightarrow x=6:2=3\)
c) \(720:\left[41-\left(2\cdot x-5\right)\right]=2^3\cdot5\)

\(720:\left[41-\left(2\cdot x-5\right)\right]=8\cdot5\)

\(720:\left[41-\left(2\cdot x-5\right)\right]=40\)
\(\Rightarrow41-\left(2\cdot x-5\right)=720:40\)

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

\(\Rightarrow2\cdot x-5=41-18\)

\(\Rightarrow2\cdot x-5=23\)
=> 2 . x = 23 + 5
=> 2 . x = 28

=> x = 28 : 2 = 14