=11-20

=-9

-(21 - 32) - (-12 + 32)
=-(-11)-20
=11-20
=-9

(21 + 32) - (-12 + 32)

= 21 + 32 + 12 - 32

= (32 - 32) + (21 + 12)

= 0 + 33

= 33

- ( 21 + 32 ) - ( - 12 + 32 )

= ( - 21 ) + 32 - ( - 12 ) - 32

= ( - 21 ) + 32 + 12 - 32

= 11 + 12 - 32

= 23 - 32

= - 9.

-(21-32)-(-12+32)

=-21+32+12-32=-21+12=-9

-(21-32)-(-12+32)

=-21+32+12-32

=-9 

thak may ban

-(21+32)-(-12+32)

= - 21 - 32 + 12 - 32

= ( - 21 + 12 ) + ( - 32 - 32 )

= - 9 - 62

= - 71

!!! k chắc

-(21+32)-(-12+32)

=-21-32-(-12)-32

=-21+(-32)+12+(-32)

=-21+12+(-32)+(-32)

=(-9)+(-64)=(-73)

Chúc bn học tốt

(− 21 − 32) − (−12 + 32) 

= −21 + 32 + 12 − 32

= −21 + 12 + 32 − 32

= −9 + 0

= −9 

nhớ k cho mình nha'

học tốt

a. (15+37)+(52-37-17)  = 15+37+52-37-17
= 15+(37-37)+52-17
= 15+0+35
= 50

a] =50

b] =27

c] = -31

d] = -12

a) ( 15 + 37 ) + ( 52 - 37 - 17 )

= 15 + 37 + 52 - 37 - 17

= 50

b) ( 38 + 42 + 14 ) - ( 25 - 27 - 15 )

= 38 + 42 + 14 - 25 + 27 + 15

= 111

c) - (21 - 32 ) - ( - 12 + 32 )

= - 21 + 32 + 12 - 32

= - 9

d) - ( 12 + 21 - 23 ) - ( 23 - 21 + 10 )

= - 12 - 21 + 23 - 23 + 21 - 10

= - 22

Trả lời:

a,(15+37) + (52-37-17)

=15+37+52-37-17

=(15+52-17)+(37-37)

=50+0

=50

b,(38+42+14)-(25-27-15)

=38-42+14-25+27+15

=(38+14-42)-(25-25)+27

=10-0+27

=37

c,-(21-32)-(-12+32)

=-21+32+12-32

= -(21+12)+(32-32)

= -9+0

=-9

d,-(12+21-23)-(23-21+10)

= -12-21+23-23+21+10

=(-12+10)-(21-21)-(23-23)

= -2-0+0

= -2

\(\text{1.(15+37)+(52-17-37)}\\ =15+37+52-17-37\\ =\left(15+52-17\right)+\left(37-37\right)\\ =50+0=50\)

\(\text{2.(21-32)-(-12+32)}\\ =21-32+12-32\\ =\left(21+12\right)+\left(-32-32\right)\\ =33+-64=-31\)

\(1,=15+37+52-17-37=50\)

\(2,=21-32+12-32=-40\)