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(3x - 6) + 9 = 3⁴ . 3

(3x - 6) + 9 = 3⁵

(3x - 6) + 9 = 243

3x - 6 = 243 - 9

3x - 6 = 234

3x = 234 + 6

3x = 240

x = 240 : 3

x = 80

Vậy x = 80.

96 + 3 . (x - 1) = 42

3 . (x - 1) = 42 - 96

3 . (x - 1) = -54

x - 1 = -54 : 3

x - 1 = -18

x = -18 + 1

x = -17

Vậy x = -17

a,x=80

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a, (3x-6)+ 9 = \(3^5\)

 (3x- 6)+ 9 = 243

3x - 6 = 243 -9

3x - 6 = 234

3x=234+6

3x=240

=> x=80

b,96 +3 .  (x-1)=42

98. (x-1)=42

x-1=98-42

x-1=56

=> x=56+1=57

`#3107.101107`

`a)`

`4,57 \times 42 + 5,43 \times 42`

`= 42 \times (4,57 + 5,43)`

`= 42 \times 10`

`= 420`

`b)`

`8,4 \times 96 + 1,6 \times 96`

`= 96 \times (8,4 + 1,6)`

`= 96 \times 10`

`= 960`

a) 4,57x42+5,43x42
= (4,57+5,43)x42
= 10x42
=420

b) 8,4x96+1,6x96
= (8,4+1,6)x96
= 10x96
= 960

a) 3.x+7=25

   3.x     = 25 -7

.  3.x     = 18

      x.    = 18 :3

.     x.    6

 a. 3.x+7=25

<=> 3x = 18

<=> x = 6

b. (5.x+4)-1=23

<=> 5x + 4 = 24

<=> 5x = 20

<=> x = 4

c. 96-3(x+1)=42

<=> 3(x + 1) = 54

<=> x + 1 = 18

<=> x = 17

d. 2^x=16

<=> 2^x = 2⁴

<=> x = 4

e. x²=16

<=> \(\orbr{\begin{cases}x^2=4^2\\x^2=\left(-4\right)^2\end{cases}}\)

<=> x = \(\pm\)4

a, 3x + 7 = 25

=> 3x = 25 - 7

=> 3x = 18

=> x = 18 : 3

=> x = 6

b, ( 5x + 4 ) - 1 = 23

=> 5x + 4 = 24

=> 5x = 24 - 4

=> 5x = 20

=> x = 20 : 5

=> x = 4

c, 96 - 3x ( x + 1 ) = 42

=> 3x ( x + 1 ) = 54

=> 4x + 3x = 54

=> 7x = 54

=> x = 54/7 

d, 2^x = 16

=> 2^x = 2⁴

=> x = 4

e, x² = 16

=> x² = 4²

=> x = 4

a) ( 3x-17) . 4⁵= 4⁶

( 3x -17) = 4⁶: 4⁵

( 3x-17) = 4

3x = 4+17

3x= 21

x= 21:3

x=7

Vậy....

b) 3 |x-5|-23=(-2)³

3 |x-5| -23 = -8

3 |x-5| = -8+23

3 |x-5| = 15

| x -5| = 15:3

|x-5| = 5

TH1: x- 5= 5

x= 5+5

x= 10

TH2: x -5 = -5

x= -5+5

x= 0

Vậy...

c) 96-3 (x+1)=42

3 ( x+1) = 96-42

3(x+1) = 54

x+1 = 54:3

x+1 = 18

x= 18-1

x= 17

Vậy...

a. (-7)+14-(-7)+4.(-14)+12

= (-7)+14+7+(-56)+12

= (-7+7)+14-56+12

= 0 + 14+12-56

= -30

b. (3x-6).3=3⁴

=> 3x-6=3⁴:3

=> 3x-6=3³

=> 3x-6=27

=> 3x=27+6

=> 3x=33

=> x=33:3

Vậy x=11.

c. 96-3(x+1)=42

=> 3(x+1)=96-42

=> 3(x+1)=54

=> x+1=54:3

=> x+1=18

=> x=18-1

Vậy x=17.

a. 96 - 3(x + 1) = 42

<=> 96 - 3x - 3 = 42

<=> 96 - 3 - 42 = 3x

<=> 3x = 51

<=> x = 17

b. (x - 37) : 12 = 9

<=> \(\dfrac{x}{12}-\dfrac{37}{12}=9\)

<=> \(\dfrac{x}{12}-\dfrac{37}{12}=\dfrac{108}{12}\)

<=> x - 37 = 108

<=> x = 108 + 37

<=> x = 145

c. 125 : (x - 3) = 5

<=> \(\dfrac{125}{x}-\dfrac{125}{3}=5\)

<=> \(\dfrac{375}{3x}-\dfrac{125x}{3x}=\dfrac{625x}{3x}\)

<=> 375 - 125x = 625x

<=> 375 = 625x + 125x

<=> 500x = 375

<=> x = \(\dfrac{375}{500}=\dfrac{3}{4}\)

a, \(15:\left(x+2\right)=3\Leftrightarrow x+2=3\Leftrightarrow x=1\)

b, \(20:\left(x+1\right)=2\Leftrightarrow x+1=10\Leftrightarrow x=9\)

c, \(240:\left(x-5\right)=2^2.5^2-20=80\Leftrightarrow x-5=3\Leftrightarrow x=8\)

d, \(96-3\left(x+1\right)=42\Leftrightarrow3\left(x+1\right)=54\Leftrightarrow x+1=18\Leftrightarrow x=17\)

a) 15 : (x + 2) = 3

x + 2 = 15 : 3

x + 2 = 5

x = 5 – 2 = 3

b) 20 : (1 + x) = 2

1 + x = 20 : 2

1 + x = 10

x = 10 – 1 = 9

c) 240 : (x – 5) = 2².5² – 20

240 : (x – 5) = 4.25 – 20

240 : (x - 5) = 100 – 20

240 : (x - 5) = 80

x – 5 = 240 : 80

x – 5 = 3

x = 3 + 5 = 8

d) 96 - 3(x + 1) = 42

3(x + 1) = 96 – 42

3(x + 1) = 54

x + 1 = 54 : 3

x + 1 = 18

x = 18 – 1

x = 17

\(15\div\left(x+2\right)=3\)                                           \(20\div\left(1+x\right)=2\)

\(x+2=15\div3\)                                               \(1+x=20\div2\)

\(x+2=5\)                                                       1+x=10

x = 5 - 2                                                           x=9

x = 3

\(240\div\left(x-5\right)=2^2\cdot5^2-20\)                                \(96-3\left(x+1\right)=42\)

\(240\div\left(x-5\right)=80\)                                              \(3\left(x+1\right)=96-42\)

\(x-5=240\div80\)                                                 \(3\left(x+1\right)=54\)

x-5=3                                                                    \(x+1=54\div3\)

x=8                                                                        x+1=18

                                                                              x=17

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