Question

tìm x thuộc Z :

a, x - [( x - 7 ) + (x - 14 + 8 )] = 2x - 14

Answer 1

 x - [( x - 7 ) + (x - 14 + 8 )] = 2x - 14

 x - [ x - 7 + x - 14 + 8 ] = 2x - 14

 x -  x + 7 - x + 14 - 8  = 2x - 14

x - x - x - 2x = -14 - 7 - 14 + 8

-3x = -27

=> x = 9

Vậy...

Chúc em học tốt!!!

Answer 2

x = 9 

#Pikachu:))#

Answer 3

x-[(x-7)+(x-14+8)]=2x-14

x-[x-7+x-14+8]=2x-14

x-x+7-x+14-8=2x-14

x-x-x-2x=-14-7-14+8

-3x=-27

=> x=9

Vậy x=9

Answer 4

x - [( x - 7 ) + (x - 14 + 8 )] = 2x - 14

     x - [ x - 7 + x - 14 + 8 ] = 2x - 14

     x -  x + 7 - x + 14 - 8  = 2x - 14

                   x - x - x - 2x = -14 - 7 - 14 + 8

                                -3x = -27

=> x = 9