a)371+(-271)+(-531)+731

=(371-271)+(-531+731)

=100+200

=300

b)-312+(-327+(-28)+27

=(-312-28)+(-327+27)

=(-340)+(-300)

=-640

c)-424+(-371)-(-424)-(-29)

=-424-371+424+29

=(-424+424)+(-371+29)

=0+(-342)

=-342

d)-249+197+248+(-197)

=(-249+248)+(197-197)

=-1+0

=-1

e)3+(-5)+(-9)+11+(-13)

=(-2)+2+(-13)

=0+(-13)

=-13

g)-8+10+(-12)+14+(-16)+18

=2+2+2

=6

a) $371+731-271-531$

$=(371-271)+(731-531)$

$=100+200$

$=300$

b) $57+58+59+60+61-17-18-19-20-21$

$=(57-17)+(58-18)+(59-19)+(60-20)+(61-21)$

$=40+40+40+40+40$

$=40\cdot5$

$=200$

c) $9-10+11-12+13-14+15-16$

$=(9-10)+(11-12)+(13-14)+(15-16)$

$=-1+(-1)+(-1)+(-1)$

$=-1\cdot4$

$=-4$

$\text{#}Toru$

giai ho mik voi

a) 22 + ( - 47 ) + ( - 153 ) + 8

= ( 22 + 8 ) - ( 47 + 153 )

= 30 - 200

= - 170

b) 9 + ( - 10 ) + 11 + ( - 12 ) + 13 + ( - 14 ) + 15 + ( - 16 )

= ( 9 - 10 ) + ( 11 - 12 ) + ( 13 - 14 ) + ( 15 - 16 )

= - 1 - 1 - 1 - 1

= - 4

c) 371 + ( - 271 ) + ( - 531 )

= ( 371 - 271 ) - 531

= 100 - 531

= - 431

d) ( - 18 ) - 54 + ( - 46 ) - 62

= ( - 18 - 62 ) - ( 54 + 46 )

= 80 - 100

= - 20

=300

=200

=-4 

Ra đề sáng tạo đó

e)371+731-271-531

=(371-271)+(731-531)

=100+200

=300

e) = (371-271)+(731-531)

= 100 + 200 = 300

f) (57 - 17)+(58-18)+(59-19)+(60-20)+(61-21)

= 40+40+40+40+40 = 200

g) (9-10)+(11-12)+(13-14)+(15-16)

= -1+(-1)+(-1)+(-1)

= -4

đế nhá

a) tự làm

b) (57-17)+(58-18)+(59-19)+(60-20)+(61-21)=40+40+40+40+40=200

c) (9+15)+(11+13)+(-10-14)+(-12-12-4)=24+24-24-24-4=-4

d)-(1+2+3+.....+2007)=\(-\dfrac{\left(1+2007\right).2007}{2}=-2015028\)

a, 879 + [ 64 + (-879) + 36 ]

= 879 + 64 - 879 + 36

= (879 - 879) + (64 + 36)

= 100

b, -564 + [ (-724) + 564 + 224 ]

= - 564 - 724 + 564 + 224

= (-564 + 564) + (-724 + 224)

= 0 - 500

= 500

c, [ 461 + (-78) + 40 ] + (-461)

= 461 - 78 + 40 - 461

= (461 - 461) + (40 - 78)

= -38

d, [ 53 + (-76) ] - [ -76 - (-53) ]

= 53 - 76 + 76 - 53

= (53 - 53) + (-76 + 76)

= 0

e, 371 + 731 - 271 - 531

= (371 - 271) + (731 - 531)

= 100 + 200

= 300

f, 57+59+60+61-17-18-19-20-21

= (57 - 17) + (59 - 19) + (60 -20) + (61 - 21) - 18

= 40 + 40 + 40 + 40 -18

= 40 *4 - 18

= 160 - 18

= 142

g, 9-10 + 11-12 + 13-14 + 15-16

= (9-10) + (11-12) + (13-14) + (15-16)

= -1 + (-1) + (-1) + (-1)

= -1 * 4

= -4

h, -1-2-3-4-5 ... -1999-2000-2001-2002

i, [ 453 + 64 + (-879) ] + (-517)

= 453 + 64 - 879 - 517

= [(453 + 64) - 517] - 879

= 0 - 879

= -879

j, -323 + [ (-874) + 564 - 241 ]

= -323 - 874 + 564 - 241

= [(-323 - 241) + 564] - 874

= 0 -874

= -874

a) \(13+22+\left(-20\right)+\left(-153\right)+8=13+22-20-153+8\)

\(=\left(13-153\right)+\left(22+8\right)-20=-140+30-20=-130\)

b) \(371+731+\left(-271\right)+\left(-281\right)=371+731-271-281\)

\(=\left(371-271\right)+\left(731-281\right)=100+450=550\)

c) \(9+\left(-10\right)+11+\left(-12\right)+13+\left(-14\right)+15+\left(-16\right)\)

\(=9-10+11-12+13-14+15-16\)

\(=\left(9-10\right)+\left(11-12\right)+\left(13-14\right)+\left(15-16\right)\)

\(=\left(-1\right)+\left(-1\right)+\left(-1\right)+\left(-1\right)=-4\)