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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.
![](https://rs.olm.vn/images/avt/0.png?1311)
7+(-12+43)-[ 2+(19-34)]
= 7 + (-12 + 43 ) - [ 2 + ( 19 - 34 ) ]
= 7 + 32 - [ 2 + ( -15 ) ]
= 7 + 32 - ( - 13 )
= 39 - ( - 13 )
= 52
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (-12).(7-72)-25.(55-43)
=(-12).(-65)-25.12
=12.(65-25)
=12.40
=480
b) (39-19):(-2)+(34-22).5
=20:(-2)+12.5
=-10+60
^HT^
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7+(-12+ 43)- [2+(19- 34)]=7+31- [2+(-15)]
=7+31-(-13)
=38-(-13)=51
7+(-12+ 43)- [2+(19- 34)]
=7+31-[2+(-15)]
=7+31-(-13)
=38-(-13)
=51
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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)
7 + (-12 + 43) - [2 + (19 - 34)]
=7 + 31 - [2 + (-15)]
=7 + 31 - (-13)
=38-(-13)
=51
7+(-12 + 43) - [2 +(19-34)]
=7 +31 - [2 + (-15)]
=38 - -13
=51
ticknha
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TL:
\(\text{a) (-12).(7-72)-25.(55-43) = (-12).(-65)-25.12 = 12.(65-25) = 12.40 = 480 b) (39-19):(-2)+(34-22).5 = 20:(-2)+12.5 = -10+60 = 50}\)
HT
\(=-19+360:\left(35-34+43\right)=-19+360:44=-\dfrac{119}{11}\)
(-19)+360:[5×7-(34-43)
= (-19) + 360 : [35 - (-9)]
= (-19) + 360 : 44
= (-19) + \(\dfrac{90}{11}\)
= \(\dfrac{-209}{11}+\dfrac{90}{11}\)
= \(\dfrac{-119}{11}\)
Tick mình nha