a) 45 - |-15| : 3 = 45 - 15 : 3 = 45 - 5 = 40

b) 737737.255 - 255255.737 = (737.1001).255 - 255255.737 = 737.(1001.255) - 255255.737 = 737.255255 - 255255.737 = 0

Cách 1: 737 737 . 255 - 255 255 . 737

= 737 . 1001 . 255 - 255 . 1001 . 737

= (737 - 737) . (1001 - 1001) . (255 - 255)

= 0 . 0 . 0

=0

\(737737\cdot255-255255\cdot737\)

\(=737\cdot1001\cdot255-255\cdot1001\cdot737\)

\(=0\)

Cách 2: 737 737 . 255 - 255 255 . 737

= 737 . 1001 . 255 - 255 . 1001 . 737

= 737 737 . 255 - 255 . 737 737

= (737 737 - 737 737) . 255

= 0 . 255

= 0

Còn có những cách khác nữa bn nhé! Chúc bn hk tốt!

a, (-123) -|-13| +(-7)

= (-123) -13+(-7)

= -136 + (-7)

= -143

b, 35- (4.5² - 5.2³) + 2019

= 35- (4. 25 - 5.8) + 2019

= 35- ( 100 - 40) + 2019

= 35 - 60 +2019

= -25 + 2019

= 1994

c, 75+ (-20) +(-30)

= 55 + (-30)

= 25

d, 135. 27- 27.35 +150

= 27.(135 - 35) +150

= 27. 100+ 150

= 2700 + 150

= 2850

e, (8-5)³ + 7⁷ : 7⁵ + 2019

= 3³ +( 7⁷ : 7⁵ ) + 2019

= 3³ +7² + 2019

= 27 + 49 + 2019

= 76 + 2019

= 2095

g, 737737. 255 - 255255. 737

= 737. 1001. 255 - 255. 1001. 737

=[( 737. 255) - (255. 737)] .1001

= 0. 1001

= 0

h, 45-|-15| : 3

= 45 - 15 : 3

= 45 - 5

= 40

f, 160 : {|-17| + [3² . 5-(14+ 2¹¹ : 2⁸)]}

= 160 : { 17 +[ 9 . 5- (14 + 2³)]}

= 160 : { 17 +[ 9 . 5- (14 + 8)]}

= 160 : [17 +( 9 . 5- 22)]

= 160 : [17 +( 45- 22)]

= 160 : ( 17 + 23)

= 160 : 40

= 4

1)

a) -(2+5) = -2 - 5 = -7

b) +(-3+6) = -3 + 6 = 3

c) (-50+3) = -50 + 3 = -47

d) -(-2+3) = 2 - 3 = -1

e) -(10-3) = -10 + 3 = -7

f) -(-3)-(-3+1) = 3 + 3 - 1 = 5

g) (-5)+(-2+10) = -5 - 2 + 10 = 3

2)

a) -50+120+(-150)-20+30

= -(50 + 20) + (120 + 30 - 150)

= -70

b) 265-70+(-65)-30+15

= (265 - 65) - (70 + 30) + 15

= 200 - 100 + 15 = 115

c) -17+185-183+(-85)-63

= (185 - 85) - (183 + 17) - 63

= 100 - 200 - 63 = -163

d) -30+60+(-170)-260+19

= -(170 + 30) - (260 - 60) + 19

= -200 - 200 + 19 = -381

a, -(-15+125-81)-(-85+75-19+100)

=-15-125+81-(-85)-75+19-100

=-140+81-(-85)-75+19-100

=-59-(-85)-75+19-100

=-16-75+19-100

=-91+19-100

=-72-100

=-172

c; 37.(24 - 77) - 24.(37 - 77)

= 37.24 - 37.77 - 24.37 + 24.77

= (37.24 - 24.37) - (37.77 - 24.77)

= 0            - 77.(37 - 24)

= - 77 . 13

= - 1001 

e) 17.15 - 34.42 + 19.17

= 17.(15 + 19) - 34.42

= 17.34 - 34.42

= 34.(17 - 42)

= 34. (-25)

= (-850)

d, (-48).(12 - 85) - 12.(85 - 48)

= -48.12 + 48.85 - 12.85 + 12.48

=  (-48.12 + 12.48) + (48.85 - 12.85)

= 0 + 85.(48 - 12)

= 85.36

= 3060 

a)58(-45+-24)+-69.42

=58.(-69)+(-69).42

=-69.(58+42)

=-69.100

=-6900

a;

A= 58.(-45) + (-58).24 + (-69).42

A = -58.(45 + 24) - 69.42

A =-58.69 - 69.42

A = -69.(58 + 42)

A = -69.100

A = -6900 

b; 139 - (-65 + 239) - (85 + 120)

B = 139 + 65 - 239 - 85 - 120

B = -(239 - 139) - (85 - 65) - 120

B =  - 100 - 20 - 120

B = - 120 - 120

B =  - 240 

c;

C = 2².3 - (1¹⁰ + 8) : 3²

C = 4.3 - (1 + 8) : 3²

C = 12 - 9:9

C = 12  - 1

C = 11

d;

D = 500 - { 5.[409 - (2³.3 - 21)² + 10³ ]}: 15

D = 500 -{5.[409 - (8.3 - 21)² + 1000]} : 15

D = 500 - {5.[409 - (24 - 21)² + 1000]} : 15

D = 500 - {5.[409 - 3² + 1000]} : 15

D = 500 - {5.[409 - 9 + 1000]} : 15

D = 500 - {5.(400 + 1000]} : 15

D = 500 - 5.1400 : 15

D = 500 - \(\dfrac{1400}{3}\)

D = \(\dfrac{100}{3}\)

737737 . 225 - 255255 . 737

= 737 . 1001 . 225 - 255 . 1001 . 737

= 0

chúc bạn học giỏi ^^

= 737.1001.225-225.1001.737

= 0 

k mk nha

-22132110

`@` `\text {Ans}`

`\downarrow`

`4.`

`a)`

\((-35) + 23 – (-35) – 47\)

`= (-35) + 23 + 35 - 47`

`= (-35 + 35) + (23 - 47)`

`= -24`

`b)`

\( 24 – (-136) – (-70) + 15 + (-115)\)

`= 24 + 136 + 70 + 15 - 115`

`= (24+136) + 70 + (-115 + 15)`

`= 160 + 70 - 100`

`= 160 - 30`

`= 130`

`c)`

\(37 – (-43) + (-85) – (-30) + 15\)

`= 37 + 43 - 85 + 30 + 15`

`= (37+43) + 30 - (85 - 15)`

`= 80 + 30 - 70`

`= 110 - 70`

`= 40`