=500-(101+102+103-104)
=500-(203+103-104)
=500-(306-104)
=500-202
=298
500 - 101 - 102 - 103 + 104
= 500 - ( 101 + 102 + 103 ) + 104
= 500 - 306 + 104
= 194 + 104
= 298
=500-(101+103-104)-102
=500-100-102
=500-202
=298
500 - 101 - 102 - 103 - 104
= 500 - ( 101 + 102 + 103 + 104 )
= 500 - 410
= 90
500 - 101 - 102 -103 + 104 = 399 - 102 -103 + 104 = 297 - 103 + 104 = 194 + 104 = 298
