300 + x = 500 + 200
300 + x = 700
x = 700 - 300
x = 400
300 + x = 500 + 200
300 + x = 700
x = 700 - 300
x = 400
300 + x = 500 + 200
300 + x = 700
x = 700 - 300
x = 400
K mk nha
300 + x = 500 + 200
300 + x = 700
x = 700 - 300
x = 400
K mk nha
300 + x = 500 + 200
300 + x = 700
x = 700 - 300
x = 400
K mk nha
300+x=500+200
300+x=700
x=700-300
x=400.
Tk mk nhé!Thank you!
300 + x = 500 + 200
300 + x = 700
x = 700 - 300
x = 400