x + 100 = 400 - 200
x + 100 = 200
x = 200 - 100
x = 100
x + 100 = 400 - 200
x + 100 = 200
x = 200 - 100
x = 100
x+100=400-200
x+100=200
x =200-100
x =100
x+100=400-200
x+100=200
x=200-100
x=100
x + 100 = 400 - 200
x + 100 = 200
x = 200 -100
x = 100
Vậy x = 100
x+100=400-200
x+100=200
x=200-100
x=100
kb nha
x + 100 = 400 - 200
x + 100 = 200
x = 200-100
x = 100