Tính nhanh ( -1075 ) - ( 29 - 1075 ) = ?
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(-1075) – (29 – 1075) = (-1075) – 29 + 1075
= (-1075 + 1075) – 29 = 0 -29 = -29
![](https://rs.olm.vn/images/avt/0.png?1311)
a. (5674 - 97) - 5674
= 5674 - 5674 - 97
= -97
b. (-1075) - (29 - 1075)
= -1075 + 1075 - 29
= -29
![](https://rs.olm.vn/images/avt/0.png?1311)
a) ( 5674 - 97 ) - 5674
= ( 5674 - 5674 ) - 97
= 0 - 97
= -97
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (5674-97) - 5674
= (5674-5674)-97
= 0-97
= -97
b) (-1075) - (29-1075)
= -1075 - 29 + 1075
= (-1075+1075) - 29
= 0 - 29
= -29
a, \(\left(5674-97\right)-5674\)
\(=\left(5674-5674\right)-97\)
\(=0-97=-97\)
b,\(\left(-1075\right)-\left(29-1075\right)\)
=\(-1075-29+1075\)
\(=\left(-1075+1075\right)-29\)
\(=0-29=-29\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, (-8)-(-12-8)=(-8)+12+8= [(-8)+8}]+12= 0+12=12
b, 1765-(312+1765)= 1765-312-1765=(1765-1765)-312=0-312=-312
c. (31-12)-(46+31-12)= 31-12+46-31+12= (31-31)+(12-12)+46=0+0+46=46
d, (5674-97)-5674=5674-97-5674=(5674-5674)-97=0-97=-97
e, (-1075)-(29-1075)=(-1075)+29+1075=[(-1075)+1075]+29=0+29=29
g, (18+29)+(158-18-29)=18+29+158-18-29=(18-18)+(29-29)+158=0+0+158=158
h, (13-135+49)-(13+49)=13-135+49-13-49=(13-13)+(49-49)-135=0+0-149=0-149=-149
![](https://rs.olm.vn/images/avt/0.png?1311)
-1075 - (29 - 1075)
= −1075 − (−1046)
= −1075 + 1046
= −29
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
( - 1075 ) - ( 29 - 1075 )
= - 1075 - 29 + 1075
= ( - 1075 + 1075 ) - 29
= 0 - 29
= - 29