如图所示
135+76-35
=(135-35)+76
=100+76
=176
435-213-87
=435-(213+87)
=435-300
=135
435-65+35
=435+35-65
=470-65
=405
654+97-54+103
=(654-54)+(97+103)
=600+200
=800
135+76-35
=(135-35)+76
=100+76
=176
435-213-87
=435-(213+87)
=435-300
=135
435-65+35
=435-(65-35)
=435-30
=405