280 - ( x - 140 ) : 35 = 270

<=>    ( x - 140 ) : 35 = 280 -270

<=>    ( x -140 ) : 35 = 10

<=>      x -140          = 10 . 35

<=>      x  -140         = 350

<=>      x                 = 350 + 140

<=>     x                  = 490 

1) 280 - ( x - 140 ) : 35 = 270

=> ( x - 140 ) : 35 = 280 - 270 = 10

     x - 140 = 350

=> x = 350 + 140

=> x = 390

2) ( 190 - 2x ) : 35 - 32 = 16

     190 - 2x = ( 16 + 32 ) . 35 = 1680

    x = ( 190 - 1680 ) : 2

   x = -745

3) 720 : { 41 - ( 2x - 5 )} -2.5

Sai đề.

4) ( x : 23 + 45 ) . 37 - 22 = 24 .105

    x : 23 + 45 = ( 24.105 + 22 ) : 37

    x : 23 = 2542/37 - 45 = 877/37

    x = 877/37.23 = 20171/37

5) ( 3x - 4 ) ( x - 1 ) = 0

=> 3x - 4 = 0 hoặc x - 1 = 0

3x - 4 = 0      hoặc x - 1 = 0

=> x = 4/3        => x = 1

Vậy x \(\in\) { 4/3;1 }

6) 2^2x : 4 = 8³

=> 2^2x = 8³ . 4 = 2048 = 2¹¹

=> 2x = 11

=> x = 11/2 

a,  2 3 x + 5 2 x = 2 5 2 + 2 3 - 33

8x+25x = 33

33x = 33

x = 1

b,  260 : x + 4 = 5 2 3 + 5 - 3 3 2 + 2 2

260:(x+4) = 5.13–3.13

x+4 = 260:26

x+4 = 10

x = 6

c,  720 : [ 41 - 2 x - 5 ] = 2 3 . 5

41–(2x–5) = 720:40

2x–5 = 41–18

2x = 28

x = 14

d,  3 2 - 2 x - 12 + 35 = 5 2 + 279 : 3 2

7(x–12)+35 = 56

7(x–12) = 21

x–12 = 3

x = 15

(190-2x):25=270

190-2x       =270.25

190-2x       =6750

      2x       =6750-190

      2x       =    6560

       x        = 6560/2=3280

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

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=14

Còn bài 3 thì mình chịu

c ( 3x² -6 ) - 43 = 5³

( 3x² -6 ) - 43 = 125

3x² -6=125+43

3x² -6=168

3x²=168+6

3x²=174

x²=174:3

x²=58(đề sai)

d) 3x + 2x ( 2³ . 5 - 3² . 4 ) + 5² = 4⁴

3x + 2x ( 8 . 5 - 9 . 4 ) + 25 = 256

3x + 2x.4 + 25 = 256

3x + 2x.4=256-25

3x + 2x.4=231

(3+2).x.4=231

5x.4=231

5x=231:4

5x=57,75

x=57,75:5

x=11,55

e) 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=28:2

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

* = nhân nhé

( ( x . 32 ) - 17 ) . 2 = 42

( ( x . 32 ) - 17 ) = 42 : 2

( ( x . 32 ) - 17 ) = 21

x . 32 = 21 + 17

x . 32 = 38

x = 38 : 32

x = 19/16

88 - 3 . ( 7 + x ) = 64

3 . ( 7 + x ) = 88 - 64 

3 . ( 7 + x ) = 24

7 + x = 24 : 3 

7 + x = 8

x = 8 - 7

x = 1

720 - [41 - (2x - 5)] = 2³.5

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

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

41 - (2x - 5) = 680

2x - 5 = 41 - 680

2x - 5 = - 639

2x = - 639 + 5

2x = - 634

x = - 317

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

 2x = 40 +41 +5 - 720

2x = 634

x = 317

\(\text{720 : [41−(2x−5)] = 40720:[41−(2x−5)]=40}\)

\(\text{⇔41−(2x−5)=720:40}\)

\(\text{⇔ 41−2x+5=18}\)

\(\text{⇒ 46 −2x=18}\)

\(\text{⇔2x=28}\)

\(\text{⇔x=14}\)

40720:[41−(2x−5)]=40

            46 −2x=18

               2x= 46

              2x=46-18

              2x=28