Question

tìm x:

x + 2 - 1 = 11

Answer 1

x + 2 - 1 = 11

x + 2 = 11 + 1

x + 2 = 12

      x = 12 - 2

      x = 10

Answer 2

x + 2 - 1 = 11

x            = 11 + 1 - 2

x            =10    

Answer 3

x + 2 - 1 = 11

x +   1   =   11

x          = 11 - 1

x          =    10

Answer 4

x + 2 - 1 = 11

x + 2      = 11 + 1

x + 2      = 12

x            = 12 - 2

x            = 10