Question

Tìm x

a.   11 x (x -6) = 4x X + 11

b.    ( X x 0,25 + 1999) x 2000 = ( 53 + 1999) x 2000

Answer 1

a: =>11x-66=4x+11

=>7x=77

hay x=11

b: =>0,25x+1999=53+1999

=>0,25x=53

=>x=53x4=212

Answer 2

`11 . (x-6)= 4.x + 11`

`11x - 66 = 4x + 11`

`(11-4)x = 11 + 66`

`7x = 77`

`=>x=77:7`

`x=11`

________________________________

`( x . 0,25 + 1999) .2000 = (53 + 1999) . 2000`

`x . 0,25 + 1999 =  (53 + 1999) . 2000 : 2000`

`x . 0,25 + 1999= 53 + 1999 . 1`

`x . 0,25 + 1999 = 2052`

`x.0,25 = 2052 - 1999`

`x.0.25 = 53`

`x=53 :0,25`

`x=212`