15.(17-111)-17.(222+15)
=15.17+15.111-17.15-17.222
=15.17+15.11-17.15-17.2.111
=15.17+15.11-17.15-34.111
=[15.17-15.17]+[111.(15-34)]
=0+111.(-19)
=-2109
15 .(17-111)-17.(222+15)
= 15.17 - 15.111 - 17.222 -17.15
= 17.15 - 17.15 - 15.111 - 17.2.111
= 111( -15 - 17.2 )
= 111 . (-49)
= 5439
-2109
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