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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(-243+345\right)-\left[257+\left(-55\right)-129\right]\)
\(=-243+345-257+55+129\)
=-500+400+129
=129-100
=29
![](https://rs.olm.vn/images/avt/0.png?1311)
(-257)-{(-257+156)-56}
<=> (-257)-(-101-56)
<=> (-257)-(-157)
<=> -100
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
-257 - [(-127 + 156) - 56]
= -257 + 127 - 156 + 56
= - (257 - 127) - (156 - 56)
= - 130 - 100
= - 230
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Kết quả:
425 - 257 = 168
91 - 56 = 35
82 - 56 = 26
73 - 56 = 17
652 - 46 - 46 - 46 = 514
Cách bấm máy tính:
![](https://rs.olm.vn/images/avt/0.png?1311)
( -2005) -[(- 257+156) -56]
= ( -2005 ) - [(-101) - 56 ]
= ( - 2005 ) - (-157 )
= -1848
(-2005)-[(-257+156)-56]
=(-2005)-[(-101)-56]
=(-2005)-(-157)
= -1848
![](https://rs.olm.vn/images/avt/0.png?1311)
(-257)-[(-257+156)-56]=-257-[-257+156-56]=(-257+257)+(156-56)=0+100=100
(-257)-[(-257+156)-56]=(-257)-[(-257+(156-56)]=(-257)-(-257)+100=-257+257+100=0+100=100
![](https://rs.olm.vn/images/avt/0.png?1311)
b)23.75+25.23+180
23.(75+25)+180
23.100+180
2300+180
2480
c)
-257-(-257)+100
(-257+257)+100
0+100
100
d)
-3-4+6
-3+(-4)+6
-7+6
-1
(-257)-[(-257+156)-56]
=(-257)-(-257+156-56)
=(-257)-(-257+100)
=-257+257-100
=(-257+257)-100
=0-100
=-100
-100 do