x+200+200=200+200+100
x+400=500
x=500-400
x=100
tk minh nha
X+200+200=200+200+100
X+(200+200)=500
X+400=500
X=500-400
X=100
x + 200 + 200 = 200 + 200 + 100
x + 400 = 500
x = 500 - 400
x = 100
x+200+200=200+200+100
x+400=500
x=-100
vậy x=-100
ai tk mk, mk tk lại.
nhầm:
x+200+200=200+200+100
x+400=500
x=100
vậy x=100
ai tk mk, mk tk lại.
x + 200 + 200 = 500
x + 200 = 500 - 200
x + 200 = 300
x = 300 - 200
x =100