x+100=500
x=500-100
x=400
tk nha
ai tk mk mk tk lai
x + 100 = 200 x 5 : 2
x + 100 = 1000 : 2
x + 100 = 500
x = 500 - 100
x = 400
x + 100 = 200 x 5 : 2
x + 100 = 1000 : 2
x + 100 = 500
x = 500 - 100
x = 400
X+100=1000:2
=> x+100= 500
=> x= 500-100
=> x=400
Vậy x= 400
x+100=200.5:2
x+100=1000:2
x+100=500
x=500-100
x=400