(8765+235)-(1143-143)=9000-1000=8000
= 8765 + 235 - 1143 + 143
= 9000 - 1143 + 143
= 9000 - (1143 - 143)
= 9000 - 1000
= 8000
8765-1143+143+235
=(8765+235)-(1143-143)
=9000-1000
=8000
8765 - 1143 + 143 + 235 = 8765 - ( 1143 - 143 - 235 )
= 8765 - ( 1000 - 235 )
= 8765 - 765
= 8000
8765 - 1143 + 143 + 235
= ( 8765 + 235 ) + ( 1143 - 143 )
= 9000 - 1000
= 8000