Question

Câu 8: ( 1,5 điểm) Tìm xÎN biết: 

a.      x + 3 = 10

b, ( 3x – 4 ) . 2³ = 64 

Answer 1

a: x+3=10

=>x=10-3

=>x=7

b: =>3x-4=64:8=8

=>3x=12

hay x=4

Answer 2

`a)`

` x + 3 = 10`

` x = 10 - 3`

` x = 7`

 

`b)`

` (3x -4) . 2^3 = 64`

` ( 3x- 4) . 8 = 64`

` 3x-4 = 64 : 8`

` 3x - 4 = 8`

` 3x = 8 +4

`3x= 12`

` x = 12 : 3`

` x = 4`

Answer 3

A: x+3=10

x=10-3

x=7

B:(3x-4).2\(^3\)=64

(3x-4).8=64

3x-4=64:8

3x-4=8

3x=8+4

x=12:3

x=4