Question

x + 600 + 400 = 20 x 20

Answer 1

x + 600 +400 = 20 x 20

x + 1000       = 400

x                 = 1000 - 400

x                 =  600

Answer 2

x + 600 + 400 = 20 x 20

x +    1000     =    400

x                   = 400 - 1000

x                   =    - 600

Answer 3

x + 600 + 400 = 20 x 20

x + 600 + 400 = 400

x + 600 = 400 - 400

x + 600 = 0

x = 0 - 600

x = -600

~mk nhanh nhất~

Answer 4

x + 600 + 400 = 20 . 20

x + 1000 = 400

suy ra x = rong