x+300=500-200-100+100
x+300=300-100+100
x+300=200+100
x+300=300
x=300-300
x=0
x+300=500-200-100+100
x+300=300
x=300-300
x=0
chúc bạn học giỏi.
x + 300 = 500 - 200 - 100 + 100
x + 300 = 300
x = 300 - 300
x = 0
chúc bạn học giỏi
x+300=500-200-100+100
x+300=300 - 100 + 100
x+300=200+100
x+300=300
x=300-300
x=0
=>x=0
x + 300 = 500 - 200 -100 + 100
x + 300 = 300
x = 300 - 300
x = 0