\(2x-49=5.32\\ \Leftrightarrow2x-49=160\\ \Leftrightarrow2x=209\\ \Leftrightarrow x=\dfrac{209}{2}\)

\(200-\left(2x+6\right)=43\\ \Leftrightarrow2x+6=157\\ \Leftrightarrow2x=151\\ \Leftrightarrow x=\dfrac{151}{2}\)

\(135-5\left(x+4\right)=35\\ \Leftrightarrow5\left(x+4\right)=100\\ \Leftrightarrow x+4=20\\ \Leftrightarrow x=16\)

3.5.(x+4)=135-35

       x+4=100:5

       x    =20-4

       x    =16

1,5 - 9/4 x+ 1/2x=0

9/4x+1/2x= -1/5

(9/4+1/2)x= -1/5

11/4x=-1/5

x= -4/55

 Bây giờ tớ sẽ sửa:

1,5 - 9/4x+1/2x=0

-9/4x+1/2x= -1,5

(-9/4 + 1/2) x= -1,5

-7/4x = -1,5

x= 6/7

cau này mình làm rồi nhưng ko nhớ

   :))))))))))))))))

Ta có : (2x - 1)³ = 125

=> (2x - 1)³ = 5³

=> 2x - 1 = 5

=> 2x = 5 + 1

=> 2x = 6

=> x = 6 : 2

=> x = 3

( 2x - 1 )³ = 125

ta có :

     (2x - 1)³ = 5³

=> 2x - 1 = 5

     2x      = 5 + 1

     2x      =   6

       x      =  6 : 2

       x      =    3

VẬY   x = 3

2^{x + 1} + 7. 2^{x + 3} = 232
2^x . 2 + 7. 2^x . 2³ = 232
2^x . 2 + 7 . 8 . 2^x = 232
2^x . 2 + 56 . 2^x = 232
2^x . ( 2 + 56 ) = 232
2^x . 58 = 232
2^x = 232 : 58
2^x = 4
2^x = 2²
=> x = 2

2^x x 2 + 7 x 2^x x 2³=232

2^x(2+7 x 2³)=232

2^x x 58 =232

2^x=232:58=4=2²

^=>x=2

2x-15=40-(3x+10)
<=> 2x-15=40-3x-10

<=> 2x-15-3x+30=0

<=> -x+15=0

<=> -x=-15

<=> x=15

\(\text{2x-15=40-(3x+10)}\)

\(\Leftrightarrow\text{2x-15=40-3x-10}\)

\(\Leftrightarrow\text{2x-15-3x+30=0}\)

\(\Leftrightarrow\text{-x+15=0}\)

\(\Rightarrow\text{-x=-15 }\)

\(\Rightarrow x=15\)

Vậy x= 15

Chúc bạn học tốt !

Câu 1: 

(2x + 1) + (2x + 2) + ... + (2x + 2015) = 0

=> 2x + 1 + 2x + 2 + ... + 2x + 2015 = 0

=> 2015.2x + (1 + 2 + ... + 2015) = 0

=> 4030x + (2015 + 1).2015:2 = 0

=> 4030x + 2031120 = 0

=> x = -504

Câu 2:

x - y = 8; y - z = 10; x + z = 12

=> (x - y) + (y - z) = 8 + 10 = 18

=> x - z = 18

=> x = (12 + 18) : 2 = 15

=> z = 15 - 18 = -3

=> y = 15 - 8 = 7

=> x + y + z = 15 + 7 + (-3) = 19

a, -504

b,19 dung thi tic minh nha