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a)25+(-13+8)
=25+(-5)=20
b)7+(-12+43)-[2+(19-34)]
=7+31-[2+(-15)]
=7+31-(-13)
=25
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 25 + ( - 13 + 8 )
= 25 + (-5)
= 20
b) 7 + ( - 12 + 43 ) - [ 2 + ( 19 - 34)]
= 7 + (-12 + 43 ) - [ 2 + (-15) ]
= 7 + 31 - (-13)
= 7 + 31 + 13
= 38 + 13
= 51
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 25 + ( - 13 + 8 )
= 25 - 13 + 8
= 20
b) 7 + ( - 12 + 43 ) - [ 2 + ( 19 - 34 ) ]
= 7 - 12 + 43 - [ 2+ 19 - 34 ]
= - 5 + 43 - 2 - 19 + 34
= 61
\(25+\left(-13+8\right)\)
\(=25-13+8\)
\(=12+8\)
\(=20\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)25+(-13+8)
=25+(-13)+8
=12+8
=20
b)7+(-12+43)+[2+(19-34)]
=7+(-12)+43+2+(-15)
=(-5)+43+2+(-15)
=38+2+(-15)
=40+(-15)
=25
nhớ tick cho mình nha!
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.7+\left(-12+43\right)-\left[2+\left(19-34\right)\right]\)
\(=7+31-\left[2+\left(-15\right)\right]\)
\(=7+31-\left(-13\right)\)
\(=38-\left(-13\right)\)
\(=51\)
\(b.25+\left(-13+8\right)\)
\(=25+\left(-5\right)\)
\(=20\)
\(c.\left(-8\right)-\text{ }\left[\left(-4\right)+6\right]\)
\(=\left(-8\right)-2\)
\(=\left(-10\right)\)
\(d.\left(-8\right)+4-6\)
\(=\left(-4\right)-6\)
\(=\left(-10\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (-12). (7 - 72) - 25. (55 - 43)
= (-12). (- 65) - 25. 12
= 12. 65 – 12. 25
= 12. (65 - 25)
= 12. 40
= 480
b) (39 - 19) : (- 2) + (34 - 22). 5
= 20 : (- 2) + 12. 5
= - 10 + 60
= 60 - 10
= 50.
a, 25+ ( - 13 + 8 )
= 25+ ( -5 ) = 20
b, 7 + ( - 12 + 43 ) - [ 2 + (19 - 34)]
= 7 + 31 - [ 2 + ( - 15 ) ]
= 7 + 31 - ( - 13 )
= 38 - ( - 13 )
= 51
tk cho mk nha![vui vui](https://hoc24.vn/media/cke24/plugins/smiley/images/vui.png)