b: \(\left(-44\right)+25+\left(-15\right)+44\)

\(=\left(-44+44\right)+\left(25-15\right)\)

=0+10

=10

c: \(201+\left(-197\right)+\left(-201\right)\)

\(=\left(201-201\right)+\left(-197\right)\)

=0-197

=-197

d: \(191+\left(-200\right)+91\)

\(=191+91-200\)

\(=91-9\)

=82

d: \(\left(-158\right)+\left[\left(-23\right)+158\right]\)

\(=-158-23+158\)

\(=\left(-158+158\right)-23\)

=0-23

=-23

e: \(\left(-2021\right)-\left[\left(-2021\right)+25\right]\)

\(=-2021+2021-25\)

=0-25

=-25

a)  − 105 + − 25 + ( − 105 ) + 50  

= 105 + 25 + ( - 105) + 50

= [105 + ( -105)] + ( 25 + 50 )

= 0 + 75 = 75

b)  465 + − 38 + − 465 − 12 − − 42

= 465 + ( - 38) + ( -465) – 12 – 42

= [ 465 + (- 465) ] – ( 12 + 42 )

= 0 – 54 = 0 + ( -54 ) = -54

c)  65. − 19 + − 19 .24 + − 19 .11

= ( - 19) . ( 65 + 24 + 11 )

= ( -19) . 100 = -1900

d)  − 3 2 + 2 3 − − 5 2 + 4 3

= 9 + 8 – 25 + 64 = 56

a: =(-23+23)+230=230

b: =54(-124+24)=-5400

c: =-927+930=3

d: =(-351+51)+(-74-126)-149=-300-200-149=-649

e: \(=\dfrac{3^3\cdot\left(2^3+2^2+1\right)}{13}=3^3=27\)

\(a,=\left[\left(-23\right)+23\right]+230=0+230=230\\ b,=\left(-124\right).54+24.54\\ =54.\left[\left(-124\right)+24\right]=54.\left(-100\right)=-5400\)

a) (-23) + 230 + 23

=([-23] + 23) + 230

=0+230

=230

b)124. (-54) + 24 . 54

= ([-54 + 54]) + (124 + 24)

=0 + 48

=48

Đây chỉ là tham khảo, nếu có si sót thì xin lỗi 

Cảm ơn!

a: \(61\cdot45+61\cdot23-68\cdot51\)

\(=61\left(45+23\right)-68\cdot51\)

\(=68\cdot61-68\cdot51\)

\(=68\left(61-51\right)=68\cdot10=680\)

b: \(3\cdot5^2-\left(75-4\cdot2^3\right)\)

\(=75-75+4\cdot8\)

\(=4\cdot8=32\)

c: \(36:\left\{2^2\cdot5-\left[30-\left(5-1\right)^2\right]\right\}\)

\(=\dfrac{36}{20-30+4^2}\)

\(=\dfrac{36}{-10+16}=\dfrac{36}{6}=6\)

d: \(\left(12\cdot49-3\cdot2^2\cdot7^2\right):\left(2020\cdot2021\right)\)

\(=\dfrac{\left(12\cdot49-12\cdot49\right)}{2020\cdot2021}=0\)

a: (-17)+5+8+17

\(=\left(-17+17\right)+\left(5+8\right)\)

=0+13

=13

b: \(\left(-24\right)+6+10+24\)

\(=\left(-24+24\right)+\left(6+10\right)\)

=0+16

=16

c: \(\left(-24\right)+6+\left(-10\right)+24\)

\(=\left(-24+24\right)+\left(6-10\right)\)

=0+(-4)

=-4

d: \(\left(-456\right)+2021-544\)

\(=2021-\left(456+544\right)\)

=2021-1000

=1021

e: \(\left(-1075\right)-29-\left(-1075\right)\)

\(=-1075+1075-29\)

=0-29

=-29

f: \(\left(-135\right)+48+140-\left(-5\right)\)

\(=48+\left(-135+140+5\right)\)

=48+10

=58

g: \(329+64+\left(-394\right)+36\)

\(=\left(329-394\right)+\left(64+36\right)\)

=100-65

=35

h: \(\left(-427\right)+\left(-123\right)+23+27\)

\(=\left(-427+27\right)+\left(-123+23\right)\)

=-400-100

=-500

a: =25-5=20

e: =-5

Bỏ qua những câu lỗi ảnh nhé 

a: -5+25=20

b: =0

c: =-72

e: =-5

dài vậy :v

a) 2763 + 152 = 2915

b) ( -7) + ( -14) = -21

c) 23 + ( -13) = 10

d) 78 + ( -123) = -45

e) ( -23) + 105 = 82

 f) 6 - ( 8 - 17) =-15

 g) | -18|+ ( -12) = 6

h) ( -20) + | 88| = 68

i) | - 37| +|15| = 52

k) 12 - 34 = -22

 l) 31 - ( -23)  = 8          

m) 19+(23-19) = 23

bạn làm đúng rồi nhé

chúc bạn học tốt@

a) 2763 + 152  = 2915     

b) ( -7) + ( -14) = - 21       

c) 23 + ( -13) = 10   

d) 78 + ( -123)= - 45       

e) ( -23) + 105 = 82       

f) 6 - ( 8 - 17)= 6- 8+ 17 = 15 hay 6 -(-9)= 6+9= 15

 g) | -18| + ( -12) = 18 -12 = 6    

h) ( -20) + | 88| = -20 +88= 68       

i) | - 37| +|15| = 37 + 15 = 52

 k) 12 - 34  = - 22               

l) 31 - ( -23) = 31 + 23 = 54           

 m) 19+(23-19) = 19 + 4 = 23 hay 19 + 23 -19 = 23

27.75 +25.27 -150 

= 27. ( 75+25 ) -150      

= 27.100 - 150 

= 2700 - 150 = 2550 

2, 34.35 -25 .12 + 105 

= 1190 - 300 + 105 

= 890 + 105 = 995

  51.8 + 25.15 - 63 

=408 + 375 - 63 

= 783 - 63 

= 720

4,918 : 9 + 20 . 46 - 132 

=102 + 20 . 46 - 132 

= 102 + 920 - 132 

= 1022 - 132 

= 890 

52 .47 - 35 .16 + 230 

= 2444 - 560 + 230 

= 1884 + 230 

= 2114 

156 + 38 .64 - 36 . 21 

= 156 + 2432 - 756 

= 2588 - 756 = 1832