a, 29 + (132+868)+(237+763)
= 29+1000+1000=2029
b,(652+148)+(327+73) + 15=1215
c,(146+54)+(121+379) = 200+500=700
d,(-452-548)+(395+605)=-1000+1000=0
a)29+132+237+868+763
=161+1105+763
=1266+763
=2029
b)652+327+148+15+73
=979+163+73
=1142+73
=1215
c)146+121+54+379
=267+433
=700
d)(-452)+395+(-548)+605
=(-57)+57
=0
29+132+237+868+763
=29+(132+868)+(237+763)
=29+1000+1000
=2900+1000
=3900
652+327+148+15+73
=(652+148)+(327+73)+15
=800+400+15
=1200+15
=1215
146+121+54+379
= (146+54)+(121+379)
= 200+500
=700
(-452)+395+(-548)+605
=[(-452)+(-548)]+395+605
=(-1000)+395+605
=[(-1000)+395)]+605
=(-605)+605
=0
29+132+237+868+763
= (29+132)+(237+868)+763
=161+1105+763
=1266+763
=2029
652+327+148+15+73
=(652+327)+(148+15)+73
=979+163+73
=1142+73
=1215
146+121+54+379
=(146+121)+(54+379)
=267+433
=700
(-452)+395+(-548)+605
=(-452+395)+[-548+605]
=-57+57
=0
