2000-x-100=300
2000-x=400
x=2000-400
x=1600
ta có: 2000-x-100+200=500
=>2000-x-100 =300
=>2000-x = 400
=>x =1600
vậy: x=1600
ai tk mk rồi mk tk lại hứa luôn.
=>2000-x-100=500-200
=>2000-x-100=300
=>x-100=300+100
=>2000-x=400
=>x=2000-400
x=1600
Vậy x=1600
2000-x-100+200=500
2000-x-100 =500-200
2000-x-100 =300
2000-x =300+100
2000-x =400
x =2000-400
x =1600