9x+34=-[2x-56]

9x+34=-2x+56

9x+2x=56-34

11x=22

x=22:11

x=2

Vậy x=2

thanks

a)

1 5 27 + 3 x − 7 9 3 = 24 27 3 x − 7 9 3 = 24 27 − 1 5 27 3 x − 7 9 3 = − 8 27 3 x − 7 9 = − 2 3 3 x = 1 9 x = 1 27

b)

2 x − 1 2 = 3 4 2 x = 5 4 x = 5 8 x = ± 5 8

c) 

2 x − 1 3 + 5 6 = 1 2 x − 1 3 = 1 6 2 x − 1 3 = ± 1 6

TH1:

2 x − 1 3 = 1 6 2 x = 1 2 x = 1 4

TH2:

2 x − 1 3 = − 1 6 2 x = 1 6 x = 1 12

Vậy  x = 1 4 hoặc x = 1 12

Chú ý rằng |a| = b với b > 0 thì a = b hoặc a = - b.

a ) x ∈ − 5 8 ; 5 8 b ) x ∈ 1 12 ; 1 4

c ) x ∈ − 17 30 ; 9 10 d ) x ∈ − 19 4 ; 11 2

a,  3 x + 1 : 3 4 = 81

3 x - 3 = 3 4

x – 3 = 4

x = 7

Vậy x = 7

b,  3 x + 3 . 3 x + 1 = 729

3 2 x + 4 = 3 6

2x + 4 = 6

x = 1

Vậy x = 1

c,  2 x + 3 . 2 x = 128

2 2 x + 3 = 2 7

2x + 3 = 7

x = 2

Vậy x = 2

d,  23 + 3 x = 5 6 : 5 3

23 + 3 x = 5 3

23 + 3x = 125

3x = 102

x = 34

Vậy x = 34

e,  2 x + 2 x + 4 = 272

2 x + 2 x . 2 4 = 272

2 x ( 1 + 2 4 ) = 272

2 x . 17 = 272

2 x = 16

2 x = 2 4

x = 4

Vậy x = 4

9x + 34 = - ( 2x - 56 )

=>9x + 34 = -  2x + 56

=> 9x - ( - 2x ) = 56 - 34

=> 9x + 2x = 22

=> 11x = 22

=> x = 22 : 11

=> x= 2

Vậy x = 2

\(a,2x+34=56\\ \Rightarrow2x=56-34\\ \Rightarrow x=22:2\\ \Rightarrow x=11\\ b,87-\left(x-654\right):3=21\\ \Rightarrow\left(x-654\right):3=87-21\\ \Rightarrow x-654=66:3\\ \Rightarrow x=22+654\\ \Rightarrow x=676\\ c,7^{65}:7^x=7^{43}.7^{21}\\ \Rightarrow7^{65-x}=7^{43+21}\\ \Rightarrow65-x=64\\ \Rightarrow x=65-64\\ \Rightarrow x=1\)

\(34.\left(-56\right)-134.56\)

\(=-56\left(34+134\right)\)

\(=-56.168=-9408\)

\(a,34.\left(-56\right)-134.\left(-56\right)\)

\(=\left(-56\right).\left(34-134\right)\)

\(=\left(-56\right).\left(-100\right)\)

\(=5600\)

Đề bài bạn viết thiếu kìa 

Cậu ơi, 34.(-56) - 134.56 hay là 34.(-56) - 134.(-56) vậy