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a/ 215 + [170 -(215+170)]
= 215 +[170 - 215 - 170]
= 215 + 170 - 215 - 170
= (215 - 215) + (170 - 170) = 0
b/ (-371)- [(-371 + 29) - 229]
= (-371) - [-371 + 29 - 229]
= (-371) + 371 - 29 + 229
= (-371 + 371) + (-29 + 229)
= 0 + 200 = 200
c/ (18 + 39) + ( 158 - 39 - 18)
= 18 + 19 + 158 - 39 - 18
= (18 - 18) + (19 - 39) + 158
= 0 - 20 + 158 = 138
d/ 25 + [-37 - 25 + (-63)]
= 25 + [-37 - 25 - 63]
= 25 - 37 - 25 - 63 = (25 - 25) + (37 - 63)
= 0 - 26 = -26
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a: =371-271-531+731=100+200=300
b: =-321-28-327+27
=-350-300
=650
c: =-424-371+424+29=-342
d: =-249+248=-1
a)371+(-271)+(-531)+731=300
b)-312+(-327+(-28)+27=650
c)-424+(-371)-(-424)-(-29)=-342
d)-249+197+248+(-197)=-1
e)3+(-5)+(-9)+11+(-13)=-13
g)-8+10+(-12)+14+(-16)+18=6
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Ta có: \(\dfrac{-371}{-459}=\dfrac{371}{459}\) là một số dương
=> \(\dfrac{-371}{-459}>\dfrac{-371}{159}\)
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[(321 - 797) + (-321 + 697)] - 371 - [1900 + (-371)]
= [321 - 797 - 321 + 697] - 371 - 1900 + 371
= [321 - 321 - 797 + 697] - 371 + 371 - 1900
= -100 - 1900
= -2000.
Học tốt.
\(\left[\left(321-797\right)+\left(-321+697\right)\right]-371-\left[1900+\left(-371\right)\right]\)
\(=321-797-321+697-371-1900-371\)
\(=\left(321-321\right)-\left(797-697\right)-\left(371-371\right)-1900\)
\(=0-100-0-1900\)
\(=-100-1900\)
\(=-2000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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-371 + 786 + 371- 986
= (371 - 371) - (986 - 786)
= 0 - 200
= -200
(-371)-[(-371+29)-229]
-371+371-29+229
=0-258
=-258
tich nha
(-371)-[(-371+29)-229]
=(-371)+371-29+229
=(-29)+299
=270