Question

Answer 1

a: =>x-302=778

=>x=1080

b: =>x-25=126

=>x=151

d: =>x-1=3

=>x=4

c: =>9x=27

hay x=3

Answer 2

`a)`

`(x-302)+123=901`

`=> x-302=901-123`

`=> x-302=778`

`=>x=778 + 302`

`=>x= 1080`

`b)`

`(x-25):7=18`

`=>x-25=18.7`

`=>x-25=126`

`=>x=126 + 25`

`=>x= 151`

`c)`

`9x-5=22`

`=>9x=22+5`

`=>9x=27`

`=>x=27:9`

`=>x=3`

`d)`

`3(x-1)=27`

`=>x-1=27:3`

`=>x-1=9`

`=>x=9+1`

`=>x=10`

`c)`

`4x^2-5=31`

`=>4x^2=31+5`

`=>4x^2=36`

`=>x^2=36:4`

`=>x^2=9`

`=>x=3`