Question

tim X biet:

X + 1999 +1000 = 1000

tk nhe

Answer 1

X + 1999 = 1000 + 1000

X + 1999 = 2000

X = 2000 - 1999

X = 1

tk nhe

Answer 2

x + 1999 + 1000 = 1000

x + 2999 = 1000

           x = 1000 - 2999

           x = -1999