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![](https://rs.olm.vn/images/avt/0.png?1311)
a) ( 17 - 229 ) + ( 17 - 25 + 229 )
= 17 - 229 + 17 - 25 + 229
= 34 - 25
= 9
b) ( 125 - 679 + 145 ) - ( 125 - 679 )
= 125 - 679 + 145 - 125 - 679
= ( 125 - 125 ) - ( 679 - 679 ) + 145
= 0 + 145
= 145
a)( 17-229)+(17-25+229)
=17-229+17-25+229
=34-25
=9
b)(125-679+145)-(125-679)
=125-679+145-125+679
=145
![](https://rs.olm.vn/images/avt/0.png?1311)
b,
=125-679+145-125+679
=(125-125)+(679-679)+145
=0+0+145
=145
chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
a) ( 17 – 229) + ( 17 - 25 + 229)
= 17 - 229 + 17 - 25 + 229
= (17 + 17) + (- 229 + 229) - 25
= 34 + 0 - 25
= 9
b) ( 125 – 679 + 145) – ( 125 – 679 )
= 125 - 679 + 145 - 125 - 679
= ( 125 - 125 ) - ( 679 - 679 ) + 145
= 0 - 0 + 145
= 145
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(-7264+\left(1543+7264\right)\)
\(=-7264+1543+7264\)
\(=\left(-7264+7264\right)+1543\)
=0+1543
=1543
b: \(\left(144-97\right)-144\)
\(=144-97-144\)
\(=\left(144-144\right)-97\)
=0-97
=-97
c: \(\left(-145\right)-\left(18-145\right)\)
\(=-145-18+145\)
\(=\left(-145+145\right)-18\)
=0-18
=-18
d: \(111+\left(-11+27\right)\)
\(=\left(111-11\right)+27\)
=100+27
=127
e: \(\left(27+514\right)-\left(486-73\right)\)
\(=27+514-486+73\)
\(=\left(27+73\right)+\left(514-486\right)\)
\(=100+28=128\)
f: \(\left(36+79\right)+\left(145-79-36\right)\)
\(=36+79+145-79-36\)
\(=\left(36-36\right)+\left(79-79\right)+145\)
=0+0+145
=145
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (125 - 679 + 145) - (125 - 679)
= 125 - 679 + 145 - 125 + 679
= ( 125 - 125) - (679 - 679) + 145
= 0 - 0 + 145
= 145
a, (125 - 679 + 145) - (125 - 679)
125-679+145-125+679
=(125-125)+(-679+679)+145
=0+0+145
=145
b, -37 + 54 + (-70) + (-163) + 246
=[-37+(-70)+(-163)]+(54+246)
=[-107+(-163)]+300
=-270+300
=30
a) ( 137 - 529 ) + ( 137 + 529 )
= 137 - 529 + 137 + 529
= ( -529 + 529 ) + (137 + 137 )
= 0 + 274
= 274
b) ( 125 - 571 = 145 ) - ( 125 - 571 )
bạn ghi sai dấu nên mình sửa lại nha
b) ( 125 - 571 + 145 ) - ( 125 - 571 )
= 125 - 571 + 145 - 125 + 571
= ( 125 -125 ) + ( -571 + 571 ) +145
= 0 + 0 + 145
=145