200 + 300 + 400 + 500
= 500 + 400 + 500
= 900 + 500
= 1400
tk nhé Linh Chi
200 + 300 + 400 + 500
= (200 + 300 + 500) + 400
= 1000 + 400
= 1400
200+300+400+500
=500+400+500
=900+500
=1400
200+300+400+500
=500+400+500
=900+500
=1400
200 + 300 + 400 + 500
=( 500 + 500 ) + 400
= 1000 + 400
= 1400
AI K MÌNH MÌNH K LẠI