a)\(2x+3x=1505\)

=>\(x\left(2+3\right)=1505\)

=>x.5=1505

=>x=1505:5

=>x=301

b)\(5x-x=4088\)

=>x(5-1)=4088

=>x.4=4088

=>x=4088:4

=>x=1022

a) 2x + 3x = 1505

(2 + 3)x = 1505

5x = 1505

x = 1505 : 5

x = 301

b) 5x - x = 4088

5x - 1x = 4088

(5 - 1)x = 4088

4x = 4088

x = 4088 : 4

x = 1022

a) 2x + 3x = 1505

   (2 + 3) x = 1505

 5x  = 1505

x = 1505 : 5

x = 301

b) 5x - x = 4088

(5 - 1) x = 4088

4x = 4088

x = 4088 : 4

x = 1022

a ) \(2x+3x=1505=x\left(2+3\right)=1505=>5x=1505\)

\(=>x=301\)

b ) \(5x-x=4088=>x\left(5-1\right)=4088\)

\(=>4x=4088=>x=1022\)

a) 2x + 3x = 1505

x ( 2 + 3 ) = 1505

x . 5 = 1505

x = 1505 : 5

x = 301

b) 5x - x = 4088

5x - 1x = 4088

( 5 - 1 ) x = 4088

4x = 4088

x = 4088 : 4

x = 1022

2x+3x=1505

5x     =1505

x       =1505:5

x       =301

Vậy x=301

5x-x=4088

4x   =4088

x    =4088:4

x    =1022

Vậy x=1022

\(a,2x+15=27\)

\(\Rightarrow2x=27-15\)

\(\Rightarrow2x=12\)

\(\Rightarrow x=12\div2\)

\(\Rightarrow x=6\)

a)2x+15=27 

=> 2x= 27-15=12

=>x=6

b) 8x-4x = 1208

=> 4x =1208

=>x=302

c) 75883 -(31200+x) =999

=> 75883-31200-999=-x

=>x=-43684

d)2x+3x=1505

=>5x=1505

=>x=301

e)5x-x=4088

=> 4x=4088

=>x=1022

a) 2x +15=27

    2x       = 27-15

    2x       = 12

      x     = 12:6

      x=   6

b) 8 x - 4x  = 1208

            4x   =  1208

            x      = 1208 : 4

            x =  302

c)   75833 - ( 31200 +x)=999

                    31200 +x= 75883-999

                      31200+x=74884

                                     x=74884-31200

                                      x=43684

d) 2x +3x=1505

     5x        = 1505

       x          = 1505:5

      x          =301

5x - x =4088

 4x     = 4088

  x      = 4088 : 4

  x     = 1022

1: =>\(5^{x-2}-9=2^4-\left(6^2-6^2\right)\)

=>\(5^{x-2}=16+9=25\)

=>x-2=2

=>x=4

2: \(\Leftrightarrow3^x+16=19^6:19^5-3=19-3=16\)

=>3^x=0

=>x=0

3: \(\Leftrightarrow2^x+2^x\cdot16=272\)

=>2^x*17=272

=>2^x=16

=>x=4

4: \(\Leftrightarrow2^{x-1}+3=24-\left(4^2-2^2+1\right)=24-\left(16-4+1\right)\)

=>\(2^{x-1}+3=24-16+4-1=8+4-1=12-1=11\)

=>2^x-1=8

=>x-1=3

=>x=4

Lời giải:

1. $(x+2)-2=0$

$x+2=2$

$x=0$

2.

$(x+3)+1=7$

$x+3=7-1=6$

$x=6-3=3$

3.

$(3x-4)+4=12$

$3x-4+4=12$

$3x=12$

$x=12:3=4$

4.

$(5x+4)-1=13$

$5x+4=13+1=14$

$5x=14-4=10$

$x=10:5=2$

5.

$(4x-8)-3=5$

$4x-8=5+3=8$

$4x=8+8=16$

$x=16:4=4$

6.

$3+(x-5)=7$

$x-5=7-3=4$

$x=4+5=9$

7.

$8-(2x-4)=2$

$2x-4=8-2=6$

$2x=6+4=10$

$x=10:2=5$

8.

$7+(5x+2)=14$

$5x+2=14-7=7$

$5x=7-2=5$

$x=5:5=1$

9.

$5-(3x-11)=1$

$3x-11=5-1=4$

$3x=11+4=15$

$x=15:3=5$

10.

$16-(8x+2)=6$

$8x+2=16-6=10$

$8x=10-2=8$

$x=8:8=1$

5x - x = 4088

( 5 - 1 ) x = 4088

4x = 4088

x   = 4088 : 4

x   = 1022

x.(5-1)=4088

4x=4088

x=4088:4

x=1022

Ta có : 5x - x = 4088

{ 5 - 1 } x = 4088

4x = 4088

x = 4088 ; 4 

x = 1022

$ a/ 12x(x – 5) – 3x(4x - 10) = 120$

`<=>12x^2-60x-12x^2+30x=120`

`<=>-30x=120`

`<=>x=-4`

Vậy `x=-4`

$b/ 9x(x + 4) – 5x(3x + 2) = 112 - 2x(3x + 1)$

`<=>9x^2+36x-15x^2-10x=112-6x^2-2x`

`<=>-6x^2+26x=112-6x^2-2x`

`<=>28x=112`

`<=>x=4`

Vậy `x=4`

$c/ 3x(1 – x) - 5x(3x + 7) = 154 + 9x(5 – 2x)$

`<=>3x-3x^2-15x^2-35x=154+45x-18x^2`

`<=>-32x-18x^2=154+45x-18x^2`

`<=>77x=-154`

`<=>x=-2`

Vậy `x=-2`