Question

Answer 1

a) x=6;7;8

c) x=3,74

d) x=8,08

e) x=5/9

Answer 2

`5,1 < x < 8,5`

`=> x = {5,2;5,21;,,,,,,,,8,49}`

Mà : `x` ={6;7}`

_______________________

`5,26 + 2x =12,74`

`2x=12,74 - 5,26`

`2x=7,48`

`x=7,48:2`

`x=3,74`

_________________________________

`5x-132 . 2 = 14`

`5x - 26,4 = 14`

`5x=14+26,4`

`5x=40,4`

`x=40,4:5`

`x=8,08`

__________________________

`x=9/5`