a, 249 - 25 × 8 + 3² ×  4

= 249 - 200 + 9 × 4

= 49 + 36

= 85

b,27 : { 480 :  [(513 : 9 + 19 ) + 84 ]}

= 27 : { 480 : [(57 + 19) + 84 ]}

= 27 : { 480 : [76 + 84]}

= 27 : { 480 : 160}

= 27 : 3

= 9

c. 73 × 25 + 28 × 25 - 25 

= 73 × 25 + 28 × 25 - 25 × 1

= 25 × (73 + 28 - 1)

= 25 × 100

= 2500

d. 2× 9 × 50 - 89⁰

= (2 × 50) × 9 - 1

= 100 × 9 - 1

= 900 - 1

= 899

a)\(249-25\cdot8+3^2\cdot4\)

\(=249-200+9\cdot4\)

\(=49+36=85\)

b)\(27:\left\{480:\left[\left(513:9+19\right)+84\right]\right\}\)

\(=27:\left\{480:\left[\left(57+19\right)+84\right]\right\}\)

\(=27:\left\{480:\left[76+84\right]\right\}\)

\(=27:\left\{480:160\right\}\)

\(=27:3=9\)

c)\(73\cdot25+28\cdot25-25\)

\(=73\cdot25+28\cdot25-25\cdot1\)

\(=\left(73+28-1\right)\cdot25\)

\(=100\cdot25=2500\)

d)\(2\cdot9\cdot50-89^0\)

\(=2\cdot9\cdot50-1\)

\(=900-1=899\)

a)249 - 25 . 8 + 3².4

= 249 - 200 + 36

=        49      +36

=               85

b)27 : { 480 : [(513:9 + 19 ) +84 ]}

= 27 : { 480 : [76+84]}

= 27: { 480 : 160 }

= 27 : 3

= 9

c) 73.25 +28.25 -25

= 25 . ( 73 +28 - 1)

= 25. 100

= 2500

d)2.9.50 - 89⁰

= 2.9.50 - 1

= 900 - 1 

= 899 

a . 27 : { 480 : [ ( 513 : 3² + 19 ) + 2² . 21 ] }

=  27 : { 480 : [ 76 + 4 . 21 ] } 

=  27 : { 480 : 160 }

= 27 : 3

= 9

b . ( -1907 ) + ( 1907 - 605 )

= ( -1907 ) + 1302 

= -605

c . - ( 76 + 159 ) + ( 159 + 176 - 48 )

= ( - 235 ) + 287 

=  52

d . ( 3096 -145 ) - ( 3096 -445 ) 

= 2951 - 2651

= 300 

câu cuối mik ko chắc nhé bạn 

k đúng cho mik na! :3

a ) 27 : { 480 : [ ( 513 : 3² + 19 ) + 2². 21]} 

= 27 :  { 480 : [ ( 513 : 9 + 19 ) + 4 . 21] } 

= 27 : { 480 : [ 76 + 84 ] }

= 27 : { 480 : 160 }

= 27 : 3

= 9

b) ( -1907) + ( 1907 - 605)

= [ ( -1907) + 1907 ] - 605

= 0 - 605

= - 605

c) -( 76+ 159 ) + ( 159 + 176 - 48 )

= -235 + 287

=52

d) ( 3096 - 145 ) - ( 3096 - 445)

= 3096 - ( 445 - 145 ) 

= 3096 - 300

=2796

tk nha bn 

1. -86 + ( -14)

= -86 - 14

= -100

2. 123 + ( -36)

= 123 - 36

= 87

3. ( -44) - ( -66)

= -44 + 66

= 22

4. -82 + (-28)

= -82 - 28

= -110

5. 83 + ( -17)

= 83 - 17

= 66

Các bài khác làm tương tự nha bạn

1/ (-86)+(-14)=-86-14=-100

2/123+(-36)=123-36=87

3/(-44)-(-66)=-44+66=22

4/-82+(-28)=-82-28=-110

5/83+(-17)=83-17=66

6/(-83)-33=(-83)+(-33)=-116

7/ 73+(-24)=73-24=49

8/84+(-48)=84-48=36

9/-72-82=-72+(-82)=-154

10/-97-82=-97+(-82)=-179

11/19+(-92)=19-92=-73

12/38-28=10

13/13+(-27)=13-27=-14

14/-85+29=-85-(-29)=-114

15/-84-(-27)=-84+27=-57

16/-23+78=-23-(-78)=-101

17/93+(-29)=93-29=64

18/-74-83=-74+(-83)=-157

19/-183+83=-183-(-83)=-266

20/849-(-3832)=849+3832=4681

Có gì sai mong bạn sửa giúp mình nhé!

ối dồi ôi nhiều thế

mk chịu

đề là gì vậy bạn

1/ -100

2/ 77

3/ 22

4/ 110

5/66

6/-116

7/49

8/36

\(a,=75+60-13=122\\ b,=250-25+40=265\\ c,=4+100-9=95\\ d,=45+80-27=98\\ e,=5^3-100=125-100=25\\ g,=5+5=10\)

a)
=\(3.5.5+3.5.2-13=3.5\left(5+2\right)-13=15.7-13=105-13=92\)
b)
\(=5^3.2-25+2^3.5=5.25-5.5+8.5=5\left(25-5+8\right)=5.28=140\)
c)
\(6^2:9+50.2-3^3.3=36:9+100-3^4\)
=\(4+100-81\)=23

a: \(3\cdot5^2+15\cdot2^2-26:2\)

\(=75+60-13\)

=122

b: \(5^3\cdot2-100:4+2^3\cdot5\)

\(=250-25+40\)

=265

c: \(6^2:9+50\cdot2-3^3\cdot3\)

\(=4+100-9\)

=95

\(1)x+23-19+48=-50\)

\(\Rightarrow x+23-19=-50-48\)

\(\Rightarrow x+23-19=-98\)

\(\Rightarrow x+23=-98+19\)

\(\Rightarrow x+23=-79\)

\(\Rightarrow x=-79-23=-102\)

\(2)3x-27-21+84=12\)

\(\Rightarrow3x-27-21=12-84\)

\(\Rightarrow3x-27-21=12+(-84)\)

\(\Rightarrow3x-27-21=-72\)

\(\Rightarrow3x-27=-72+21\)

\(\Rightarrow3x-27=-51\)

\(\Rightarrow3x=-51+27\)

\(\Rightarrow3x=-24\)

\(\Rightarrow x=-24\div3=-8\)

Chúc bạn  học tốt ~

\(a,x+23-19+48=-50\)

\(\Rightarrow x=-50-23+19-48\)

\(\Rightarrow x=-102\)

\(3x-27-21+84=12\)

\(3x=12-84+21+27\)

\(\Leftrightarrow3x=-24\)

\(\Leftrightarrow x=-8\)