a: \(\left(24-234\right)+\left(234-24-77\right)\)

\(=24-234+234-24-77\)

\(=\left(24-24\right)+\left(234-234\right)-77\)

=0+0-77

=-77

b: \(\left(13-135+49\right)-\left(13+49\right)\)

\(=13-135+49-13-49\)

\(=\left(13-13\right)+\left(49-49\right)-135\)

=0+0-135

=-135

c: \(159-524-\left(59-424\right)\)

\(=159-524-59+424\)

\(=\left(159-59\right)-\left(524-424\right)\)

=100-100

=0

d: \(\left(36+79\right)+\left(145-79-36\right)\)

\(=36+79+145-79-36\)

\(=\left(36-36\right)+\left(79-79\right)+145\)

=0+0+145

=145

e: \(334-\left(117+234\right)+\left(42+117\right)\)

\(=334-117-234+42+117\)

\(=\left(334-234\right)+\left(117-117\right)+42\)

=100+0+42

=142

f: \(271-\left[\left(-43\right)+271-\left(-17\right)\right]\)

\(=271+43-271+\left(-17\right)\)

\(=\left(271-271\right)+\left(43-17\right)\)

=0+26

=26

-(-60+59+32)+(91+59+32)
=60-59-32+91+59+32
=151
Tick cho mình nha Huynh thị kim như
 

  (478-739)+739
= 478 - 739 + 793
= 793 - 793 + 478
= 00 + 478
= 478

   524-(524-213)
= 524 - 524 + 213
= 0 + 213
= 213

   (145-342)+(342-45)
= 145 - 342 + 342 - 45
= 342 - 342 +145 - 45
= 00 + 145 - 45
= 100

   (-75+94)-(25+94)
= -75 + 94 - 25 - 94
= 94 - 94 - 75 - 25
= 00 - 75 - 25
= -100

3.20

a) (-28) + (-35) – 92 + (-82)

= -28 – 35 – 92 – 82 

= - (28 + 35 + 92 + 82)

= - [(28 + 82) + (35 + 92)]

= - (110 + 127)

= - 237.

b) 15 – (-38) + (-55) – (+47)

= 15 + 38 – 55 – 47

= 53 – 55 – 47

= - (55 – 53) – 47

= - 2 – 47

= - (2 + 47)

= - 49

Bài 3.20:

a: =-28-35-92-82

=-110-127

=-237

b: =15+38-55-47

=-40-47+38

=-2-47

=-49

Bài 3.21:

a: =62-81-12+59-9=50+50-81=19

b: =39-13-62-39=-75

3.21

a) (62 - 81) – (12 – 59 + 9)

= 62 – 81 – 12 + 59 – 9

= (62 – 12) – (81 + 9) + 59

= 50 – 90 + 59

= - (90 – 50) + 59

= - 40 + 59

= 59 – 40

= 19

b) 39 + (13 – 26) – (62 + 39)

= 39 + 13 – 26 – 62 – 39

= (39 – 39) – (26 + 62) + 13

= 0 – 88 + 13

= - 88 + 13

= - (88 – 13)

= - 75.

A=[(-51)+59]-[(-51)-(-59)]

=[(-51)+59]-[(-51)+59]

=(-51)+59+51-59

=[(-51)+51)]+(59-59)

=0+0

=0

Chúc bạn học giỏi nha!!!

K cho mik vs nhé

Ko ghi đề nữa nha, bỏ ngoặc luôn

(51+59)-(51+59)= 110+110= 220

Nhanh nhất nek, TÍCH NHA

mình làm ý a hen

25-(30-7)+75-47

=25-(30-7)+28

=25-23+28

=2+28

=30

\(25-\left(30-7\right)+75-47\)

\(=25-30+7+75-47\)

\(=30\)

\(\left(-54-91\right)-\left(59-74\right)\)

\(=-54-91-59+74\)

\(=-130\)

câu kia tương tự nha

(201-111+29)-(-119+230)

=90+(119-230)

=90+(-111)

=-21

a)(201-111+29)-(-119+230)

=(201-111+29)+119-230

=119+119-230

=8

b)567+[(-99)+41]+(-708)

=567+(-58)+(-708)

=-199

c)[171+(-159)-[-183-(-195)]

=171+(-159)-[-183+195]

=171+(-195)-12

=-36

d)(225+135)+90-[315+(-685)]

=360+90-(-370)

=820

567 +[(-99) + 41]+(-708)

567+ (-58)+(-708)

509+(-708)

-199

Lời giải:
a. $=13-47-13-59+81+35-13$

$=(13-13-13)-(47+59)+(81+35)$
$=-13-106+116=-13+(116-106)=-13+10=-3$

b.

$=345-61+84+61-116-345$

$=(345-345)+(-61+61)-(116-84)$

$=0+0-32=-32$

a, $(13-47)-(13+59-81)+(35-13)$

$=13-47-13-59+81+35-13$

$=(13-13)+(-47-13)+(-59+81)+35$

$=-60+22+35$

$=-38+35$

$=-3$

$---$

b, $(345-61+84)-(-61+116+345)$

$=345-61+84+61-116-345$

$=(345-345)+(-61+61)+(84-116)$

$=-32$