Question

tìm x

a)(4600 + 6400) - 7.x = 3839

b)[(8x - 14 ) : 2 - 2 ]. 31 = 341

c)2.(x - 3) - x = 4.2³

Answer 1

a)(4600 + 6400) - 7.x = 3839

11000-7x=3839

7x=7161

x=1023

Vậy x=1023

b)[(8x - 14 ) : 2 - 2 ]. 31 = 341

(8x - 14 ) : 2 - 2=11

(8x - 14 ) : 2=13

8x - 14 =26

8x=40

x=5

Vậy x=5

c)2.(x - 3) - x = 4.2^3

2.(x - 3) - x=32

2x-6-x=32

x-6=32

x=38

Vậy x=38

Answer 2

Bài 1 : Tìm x

a, ( 4600 + 6400 ) - 7.x = 3839

11000 - 7.x = 3839

7.x = 11000 - 3839

7.x = 7161

x = 7161: 7

x = 1023

b, [ ( 8x - 14 ) : 2 - 2 ] . 31 = 341

( 8x -14 ) : 2 -2 = 11

( 8x -14 ) : 2 = 13

8x -14 = 26

8x = 40

x = 5

c, 2. ( x -3 ) - x = 4. 2³

2x - 6 - x = 32

x - 6 = 32

x = 38

Answer 3

a)1023

b)5

c)38