Question

tìm x bt

Answer 1

a: =>x=17-48+15=32-48=-16

b: =>x-21=-11

=>x=10

c: =>x-12=-24

hay x=-12

Answer 2

`x-15=17-48`

`x-15=-31`

`x=-31+15`

`x=-16`

____________________

`x-21=(-7)-4`

`x-21=-7-4`

`x-21=-11`

`x=-11+21`

`x=10`

______________________

`x-12=(-9)-15`

`x-12=-9+15`

`x-12=-24`

`x=-24+12`

`x=-12`