9000+1000-1000+2000-3000+2000
=8000-1000+2000-3000+2000
=7000+2000-3000+2000
=9000-3000+2000
=6000+2000
=8000
tk nhé
=10000-1000+2000-3000+2000
=9000+2000-3000+2000
=8000+2000
=10000
9000 + 1000 - 1000 + 2000 - 3000 + 2000
= 10000 - 1000 + 2000 - 3000 + 2000
= 9000 + 2000 - 3000 + 2000
= 11000 - 3000 + 2000
= 8000 + 2000
= 10000