a) \(232-\left(581+132-331\right)\)

\(=232-581-132+331\)

\(=\left(232-132\right)+\left(331-581\right)\)

\(=100-250\)

\(=-150\)

b) \(\left[12+\left(-57\right)\right]-\left[-57-\left(-12\right)\right]\)

\(=12-57+57-12\)

\(=\left(12-12\right)+\left(57-57\right)\)

\(=0+0\)

\(=0\)

a) 232 - ( 581 + 132 - 331 )

= 232 - 581 - 132 + 331

= ( 232 - 132 ) - ( 581 - 331 )

= 100 - 250

= -150

a: \(232-\left(581+132-331\right)\)

\(=232-581-132+331\)

\(=\left(232-132\right)+\left(-581+331\right)\)

\(=100-250\)

=-150

b: \(\left[12+\left(-57\right)\right]-\left[-57-\left(-12\right)\right]\)

\(=12+\left(-57\right)+57+\left(-12\right)\)

\(=\left(12-12\right)+\left(57-57\right)\)

=0+0

=0

a) 232 - (581 + 132 - 331)

= 232 - 581 - 132 + 331

= (232 - 132) - (581 - 331)

= 100 - 250

= -(250 - 100)

= -150

b) [12 + (-57)] - [-57 - (-12)]

= 12 - 57 + 57 - 12

= (12 - 12) + (57 - 57)

= 0 + 0

= 0

Bài 3.21:

b: =28+19-28-32+57

=76-32

=44

a, -321 + (-29 ) - 142 - (-72) = -321 - 29 - 142 + 72 = -420.

b, 214 - (-36) + (-305) = 214 + 36 - 305 = -55.

c, 232 - (581 + 132 - 331) = 232 - 581 - 132 + 331 = -150.

d, [ 12+ (-57)] - [-57 -  (-12) = 12 - 57 + 57 - 12 = 0.

a) = 10 . (-4) + 24. 4

    = 10.(-4) + 96

    = 56

Ở dưới mình nhầm nha hihi

= -800

a ) 1 2 . b ) − 2 5 . c ) − 7 8 . d ) 0. e ) 0.

a. 57 + 58 + 59 + 60 + 61 - 17- 18 - 19 - 20 - 21

= (57 - 17) + (58 - 18) + (59 - 19) + (60 - 20) + (61 - 21)

= 40 + 40 + 40 + 40 + 40

= 40 . 5

= 200

b. 9 - 10 + 11 - 12 + 13 - 14 + 15 - 16

= ( 9 - 10 ) + ( 11 - 12 ) + ( 13 - 14 ) + ( 15 - 16 )

= -1 + (-1) + (-1) + (-1)

= (-1) . 4

= -4

a/ [57+(-17)] + [58+(-18)] ....+ [61+(-21)]

= 40 + 40 +40+40+40

= 40 nhân 5

= 200

b/ 9-10+11-12+13-14+15-16

= -1+-1+-1+-1

= -1 nhân 4

= -4

olm duyệt đi

a: -23-12=-(23+12)=-35

a: -100-12=-(100+12)=-112

a: -123-20=-(123+20)=-143

a: 43-(-53)=43+53=96

a: 14-(-20)=14+20=34

a: -15-(-17)=-15+17=17-15=2

a: 143-(-123)=143+123=266

b: 12-(5-7)=12-(-2)=12+2=14

b: 15-(-9)-4=11+9=20

b: -17-(8-25)=-17-8+25=-25+25=0

b: -5+10-12-5=(10-5-5)-12=0-12=-12

b: (1456+23)-1456=1456-1456+23=0+23=23

b: (2354-45)-2354=2354-45-2354=-45

b: -2021-(57-2021)=-2021-57+2021=-57

c: 283+581-282-531=(283-282)+(581-531)=50+1=51

c: 3758+57-3769-66

=(3758-3769)+(57-66)

=(-11)+(-9)

=-(11+9)

=-20

c: 2575+37-2575+29

=37+29

=66

c: 17+33+(-37)+(-33)

=(17-37)+(33-33)

=0+(-20)

=-20

c: -4+(-10)+25+(-11)

=(-4-10-11)+25

=25-25

=0

c: 42-69+17+(-42)-17

=(42-42)+(17-17)+(-69)

=-69

c: (-2)+(-370)+(-8)+370

=(-2-8)+(-370+370)

=-10+0

=-10