145+43+(-145)+57
=[145+(-145)]+(43+57)
=0+100
=100
Vote mình nhé!

hoi gi ki  vay ban

1; - 7264 + (1543 + 7264)

= - 7264 + 1543 + 7264

= (-7264 + 7264) + 1543

= 0 + 1543

= 1543

2; (144 - 97) - 144

= 144 - 97 - 144

= (144 - 144) - 97

= 0 - 97

= - 97 

3; (-145) - (18 - 145)

=  - 145 -  18 + 145

= (-145 + 145) - 18

= 0 - 18

= - 18

1; - 7264 + (1543 + 7264)

= - 7264 + 1543 + 7264

= (-7264 + 7264) + 1543

= 0 + 1543

= 1543

2; (14497) - 144

= 14497 - 144

= 14353

3; (-145).(18145)

= -145.18145

= -2631025

4; 111 + (-11 + 27)

= 111 + 16

= 127

5; (27 + 514) - (486 - 73)

= 27 + 514 - 486 + 73

= (27 + 73) + (514 - 486)

= 30 + 28

= 58

6; (36 + 79) + (145 - 79 -  36)

= 36 + 79 + 145 - 79 - 36

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

= 0 + 0 + 145

= 145

1) - 7264 + ( 1543 + 7264 )

= - 7264 + 1543 + 7264 

= ( - 7264 + 7264 ) + 1543

= 0 + 1543 

= 1543

2) ( 144 - 97 ) - 144

= 144 - 97 - 144

= ( 144 - 144 ) - 97

= 0 - 97 

= - 97

3) ( - 145 ) - ( 18 - 145 )

= -145 - 18 + 145

= ( - 145 + 145 ) - 18

= 0 - 18 

=  - 18 

4) 111 + ( - 11 + 27 )

= 111 - 11 + 27

= 100 + 27 

= 127 

các câu còn lại bn tự làm nha

1. -7264+(1543+7264)                                                     

=-7264+1543+7264

=[-7264+7264]+1543

=0

1,-7264+(1543+7264)=-7264+1543+7264=(-7264+7264)+1543=0+1543=1543

2,(144-97)-144=144-97-144=(144-144)-97=0-97=-97

3,(-145)-(18-145)=-145-18+145=(-145+145)-18=0-18=-18

4,111+(-11+27)=111-11+27=100+27=127

5,(27+514)-(486-73)=27+514-486+73=(27+73)+(514-486)=100+28=128

6,(36+79)+(145-79-36)=36+79+145-79-36=(36-36)+(79-79)+145=0+0+145=145

7,10-[12-(-9-1)]=10-[12+9+1]=10-12-9-1=10-10-12=0-12=-12

8,(38-29+43)-(43+38)=38-29+43-43-38=(38-38)+(43-43)-29=0+0-29=-29

9,271-[(-43)+271-(-17)]=271-[-43+271+17]=271+43-271-17=(271-271)+(43-17)=0+26=26

10,-144-[29-(+144)-(+144)]=-144-[29-144-144]=-144-[29-144-144]=-144-29+144+144=(-144+144)+(144-29)=0+115=115

chia từng câu ra rồi mình giải cho nhé , nhiều câu quá

nhiều ai mà lm đc

cậu chia ra,cái này quá đơn giản nhưng dài quá mik hơi lười

1)-7264+(1543+7264)=-7264+1543+7264=1543

2)(144-97)-144=144-97-144=-97

3)(-145)-(18-145)=-145-18+145=-18

4)111+(-11+27)=111-11+27=100+27=127

5)(27+514)-(486-73)=27+514-486-73=541-486-73=55-73=-18

6)(36+79)+(145-79-36)=36+79+145-79-36=145

7)10-[12-(-9-1)]=10-[12+9+1]=10-12-9-1=-12

8)(38-29+43)-(43+38)=38-29+43-43-38=-29

9)271-[(-43)+271-(-17)]=271-[-43+271+17]=271+43-271-17=43-17=26

10)-144-[29-(+144)-(+144)]=-144-[29-144-144]=-144-29+144+144=-29+144=115

a: \(145+43+\left(-145\right)+57\)

\(=\left(145-145\right)+\left(43+57\right)\)

=0+100

=100

b: \(\left(-123\right)+101+\left(-777\right)+99\)

\(=\left(-123-777\right)+\left(101+99\right)\)

=-900+200

=-700

c: \(\left(-8955\right)+33+\left(-45\right)+\left(-133\right)\)

\(=\left(-8955-45\right)+\left(33-133\right)\)

\(=\left(-9000\right)+\left(-100\right)=-9100\)

d: \(\left(-2\right)+\left(-4\right)+\left(-6\right)+\left(-8\right)+\left(-10\right)+8+10+12\)

\(=\left(12-2\right)+\left(-4-6\right)+\left(-8+8\right)+\left(-10+10\right)\)

=10-10+0+0

=0

Bài 1:

a) −x + 8 = −17

−x = −17 − 8

−x = −25

⇒ x = 25

Vậy x = 25

x = −2

c) x − 45 = −17

x = −17 + 45

x = 28

Vậy x = 28

d) |x + 1| = 20 (>0)

TH₁: x + 1 = 20       TH₂: x + 1 = −20

x = 20 − 1                        x       = −20 − 1

x = 19                              x       = −21

Vậy x∈\(\left\{-21;19\right\}\)

e) |x − 3| − 16 = −4

|x − 3| = −4 + 16

|x − 3| = 12 (>0)

TH₁: x − 3 = 12             TH₂: x − 3 = −12

x = 12+3                                x = −12 + 3

x = 15                                    x = −9

Vậy x∈\(\left\{-9;15\right\}\)

b) 35 − x = 37

x = 35 − 37

x = −2

Vậy x = −2

Bài 2: 

a) (144 − 97) − 144

= 144 − 97 − 144
= (144 − 144) − 97
= − 97

b) (−145) − (18 − 145)

= −145 − 18 + 145

= (−145 + 145) − 18

= −18

c) (27 + 514) − (486 − 73)

= 27 + 514 − 486 + 73

= (27 + 73) + (514 − 486)

= 100 + 28

= 128

d) (38 − 29 + 43) − (43 + 38)

= 38 − 29 + 43 − 43 − 38

= (−38 + 38) + (−43 + 43) − 29

= 0 + 0 − 29

= −29