a) \(\left(17-229\right)+\left(17-25+229\right)\)
\(=17-229+17-25+229=9\)
b) \(\left(125-679+145\right)-\left(125-679\right)\)
\(=125-679+145-125+679=145\)
a.17-229+17-25+229
=(17+17)+(-229+229)+(-25)
=34+0+(-25)
=9
b.125-679+145-125+679
=(125-125)+(-679+679)+145
=0+0+145
=145
a. (17-229) +(17-25+229)
= 17-229+17-25+229
=(299-299)+17+17+25
=59
b.(125-679+145)-(125-679)
=125-679+145-125+679
=(125-125)+(679-679)+145
=0+0+145
=145
a) (17−229)+(17−25+229)(17−229)+(17−25+229)
=17−229+17−25+229=9=17−229+17−25+229=9
b) (125−679+145)−(125−679)(125−679+145)−(125−679)
=125−679+145−125+679=145
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