a)
17-229+17-25+229
=34-25+0
=9
b)
125-679+145-125+679
= 0 + 145 + 0
=145
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a)17-229+17-25+229 b)125-679+145-125-629
=(17-17)+(229-229)+25 =(125-125)+(679-679)+145
=0+0+25 = 0+0+145
25 =145