=27-514-486+73

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

=-1000+100

=-900

=> 493 - 413

= 80

( 27 - 514 ) - ( 486 - 73 )

= - 487 - 413

= - 900

a, 2075-(-37+2076+47)

= 2075 + 37 - 2076 - 47

= - (2076-2075) - (47-37)

= -1 - 10

= -11

b, 34 + 35 + 36 + 37 - 14 - 15 - 16 - 17

= (34-14) + (35-15) + (36-16) + (37-17)

= 20 + 20 + 20 + 20

= 20.4

= 80

c, (27-514)-(486-73)

= 27 - 514 - 486 + 73

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

= 100 - 1000

= -900

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

= (27 + 73) – (514 + 486) = 100 – 1000 = -900

= 27 + 514 - 486 + 73

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

= 100 + 28 =128

(27+514)-(486-73)

=541-413

=128 

mình trước nha 

\(\text{(27+514)-(486-73)}\)

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

\(=\left(27+73\right)+\left(514-486\right)\)

\(=100+28\)

\(=128\)

   ( 27 + 514 ) - ( -486 - 73 )

= 27 + 514 + 486 + 73

= ( 27 + 73 )  + ( 514 + 486 )

= 100 + 1000

= 1100

(27+514)-(486-73)

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

=100+28

=128

= 27 - 514 - 486 + 73

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

= 100 - 1000

= -900

( 27 - 514 )-(486-73)

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

= 1000 -100

= 900

\(\left(27-514\right)-\left(486-73\right)\)

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

\(=\left(27+73\right)-\left(514+486\right)\)

\(=100-1000=-900\)

\(\text{( -12 ) + ( -13 ) + 36 + ( - 11 )}\)

\(=\left[\left(-12\right)+\left(-13\right)+\left(-11\right)\right]+36\)

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

\(=0\)

\(\text{- 16 + 24 + 16 _ 34}\)

\(=\left(-16+16\right)+\left(24-34\right)\)

\(=0+\left(-10\right)\)

\(=-10\)

\(\text{25 + 37 _ 48 _ 25_ 37}\)

\(=\left(25-25\right)+\left(37-37\right)-48\)

\(=0+0-48\)

\(=-48\)

\(\text{2575 + 37 _ 2576 _ 29}\)

\(=\left(2575-2576\right)+\left(37-29\right)\)

\(=\left(-1\right)+8\)

\(=7\)

\(\text{34 + 35 + 36 + 37 _ 14 _ 15 _ 16 _ 17}\)

\(=\left(34-14\right)+\left(35-15\right)+\left(36-16\right)+\left(37-17\right)\)

\(=10+10+10+10\)

\(=40\)

\(\text{( 27 + 514 ) _ ( 486 _ 73 )}\)

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

\(=\left(27+73\right)+\left(514-486\right)\)

\(=100+28\)

\(=128\)

chúc bạn học tốt

Bài 1: tính hợp lí:

( -12 ) + ( -13 ) + 36 + ( - 11 )

= [ - 12 + ( - 13 ) + ( - 11 ) ] + 36

= ( - 36 ) + 36

= 0

- 16 + 24 + 16 - 34

= ( - 16 + 16 ) + ( 24 - 34 )

= 0 + ( - 10 )

= - 10

25 + 37 - 48 - 25 - 37

= ( 25 - 25 ) + ( 37 - 37 ) - 48

= 0 + 0 - 48

= - 48

2575 + 37  - 2576 -  29

= ( 2575 - 2576 ) + ( 37 - 29 )

= - 1 + 8

= 7

34 + 35 + 36 + 37  - 14 - 15 - 16 - 17

= ( 34 - 14 ) + ( 35 - 15 ) + ( 36 - 16 ) + ( 37 - 17 )

= 20 + 20 + 20 + 20

= 20 x 4

= 80

Bài 2:  bỏ dấu ngoặc rồi tính:

( 27 + 514 )  -  ( 486  - 73 )

= 27 + 514 - 486 + 73

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

= 100 + 28

= 128