a) ( -96) +64

= -32

b) | -29| + ( -11)

= 29 + ( -11)

=18

c) ( -367) +(-33)

=400

d) (-45)-30

= -15

e) (-28)-(-32)

= -28 + 32

= 4

f) ( -3) + 350 + (-7) +350

= -10 + 350+350

= 340+350

= 690

g) (-1075) -(29-1075)

= -1075 -29 +1075

= (-1075+1075) -29

= 0 -29

= -29

a: \(\left(-17\right)+5+\left(-8\right)+17\)

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

=0-3

=-3

b: \(\left(-9\right)+\left(-11\right)+21+\left(-1\right)\)

\(=\left(-9-1\right)+\left(21-11\right)\)

=10-10

=0

c: \(15+23+\left(-25\right)+\left(-23\right)\)

\(=\left(15-25\right)+\left(23-23\right)\)

=-10+0

=-10

d: \(\left(-3\right)+\left(-350\right)+\left(-7\right)+350\)

\(=\left(-3-7\right)+\left(-350+350\right)\)

=-10+0

=-10

e: \(\left(-3\right)+\left(-250\right)+\left(-7\right)+250\)

\(=\left(-3-7\right)+\left(-250+250\right)\)

=-10+0

=-10

f: \(\left(-4\right)+\left(-440\right)+\left(-6\right)+440\)

\(=\left(-4-6\right)+\left(-440+440\right)\)

=-10+0

=-10

g: \(483+\left(-56\right)+263+\left(-64\right)\)

\(=\left(483+263\right)+\left(-56-64\right)\)

\(=746-110=636\)

h: \(215+43+\left(-215\right)+\left(-25\right)\)

\(=\left(215-215\right)+\left(43-25\right)\)

=0+18

=18

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

= [5 + (-8)] + [(-17) + 17]

= -3

b. (-9) + (-11) + 21 + (-1)

= [(-9) + (-1)] + [21 + (-11)]

= -10 + 10

= 0

c. 15 + 23 + (-25) + (-23)

= [15 + (-25)] + (23 - 23)

= -10

d. (-3) + (-350) + (-7) + 350

= [(-3) + (-7)] + [(-350) + 350]

= -10

e. (-3) + (-250) + (-7) + 250

= [(-3) + (-7)] + [(-250) + 250]

= -10

f. (-4) + (-440) + (-6) + 440

= [(-4) + (-6)] + [(-440) + 440]

= -10

g. 483 + (-56) + 263 + (-64)

= (483 + 263) + [(-56) + (-64)]

= 746 + (-120)

= 626

h. 215 + 43 + (-215) + (-25)

= [215 + (-215)] + [43 + (-25)]

= 18

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

= [5 + (-8)] + [(-17) + 17]

= -3

b) (-9) + (-11) + 21 + (-1)

= [(-9) + (-1)] + [21 + (-11)]

= -10 + 10

= 0

c) 15 + 23 + (-25) + (-23)

= [15 + (-25)] + (23 - 23)

= -10

d) (-3) + (-350) + (-7) + 350

= [(-3) + (-7)] + [(-350) + 350]

= -10

e) (-3) + (-250) + (-7) + 250

= [(-3) + (-7)] + [(-250) + 250]

= -10

f) (-4) + (-440) + (-6) + 440

= [(-4) + (-6)] + [(-440) + 440]

= -10

g) 483 + (-56) + 263 + (-64)

= (483 + 263) + [(-56) + (-64)]

= 746 + (-120)

= 626

h) 215 + 43 + (-215) + (-25)

= [215 + (-215)] + [43 + (-25)]

= 18

\(\dfrac{4}{5}\)+\(\dfrac{-5}{4}\)=\(\dfrac{0}{4}\)

\(\dfrac{-1}{3}\)+\(\dfrac{2}{5}-\dfrac{5}{6}\)=\(\dfrac{-10}{30}+\dfrac{12}{30}-\dfrac{25}{30}\)=\(\dfrac{-23}{30}\)

\(\dfrac{2}{3}-\dfrac{5}{7}.\dfrac{14}{25}\)=\(\dfrac{2}{3}-\dfrac{2}{5}\)=\(\dfrac{10}{15}-\dfrac{6}{15}\)=\(\dfrac{4}{15}\)

a: \(=\dfrac{16-25}{20}=\dfrac{-9}{20}\)

b: \(=\dfrac{-10}{30}+\dfrac{12}{30}-\dfrac{25}{30}=-\dfrac{23}{30}\)

c: \(=\dfrac{2}{3}-\dfrac{1}{5}\cdot2=\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{10-6}{15}=\dfrac{4}{15}\)

d: \(=\dfrac{12-25}{30}\cdot\dfrac{15}{8}-1=\dfrac{-13}{16}-1=\dfrac{-29}{16}\)

e: \(=\dfrac{-3}{13}-\dfrac{10}{13}-\dfrac{7}{17}+\dfrac{24}{17}-\dfrac{5}{19}-\dfrac{14}{19}=-1\)

1a: 16

1. Tính tổng

a) ( - 24 ) + 6 + 10 +24

= [ ( -24 ) + 24 ] + ( 6 + 10)

= 0 + 16

= 16

b) 15 + 23 + ( - 25 ) + ( - 23 )

= (15 + 25 ) + [23 + ( -23 ) ]

= 40 + 0

= 40

c) ( - 3 ) + ( - 350 ) + ( - 7 ) + 350

= [ ( -3 ) + ( -7 ) ] + [ ( -350 ) + 350 ]

= -10 + 0

= -10

d)  ( - 9 ) + ( - 11 ) + 21 + ( - 1 )

= [ (-9) + (-1) ] + [ (-11) + 21 ]

= -10 + 10

= 0

2. Đơn giản biểu thức 

a) x + 25 + ( - 17 ) + 63

= x + ( 25 - 17 + 63 )

= x + 71

b)  ( - 75 ) - ( p + 20 ) + 95

= -75 - p - 20 + 95

= ( -75 - 20 + 95 ) - p

= 0 - p

= -p

3. Tính nhanh các tổng sau

a) ( 5674 - 97 ) - 5674

= 5674 - 94 - 5674

= ( 5674 - 5674 ) -94

= 0 - 94

= -94

b) (- 1075 ) - ( 29 - 1075 )

=-1075 - 29 + 1075

= ( -1075 + 1075 ) - 29

= 0 - 29

= -29

4. Bỏ dấu ngoặc rồi tính 

a )  ( 18 + 29 ) + ( 158 - 18 - 29 )

= 18 + 29 + 158 - 18 - 29

= ( 18 - 18 ) + ( 29 - 29 ) + 158

= 0 + 0 + 158

= 158

b )   ( 13 - 135 + 49 ) - ( 13 + 49 )

= 13 - 135 + 49 - 13 - 49

= ( 13 - 13 ) + ( 49 - 49 ) - 135

= 0 + 0 - 135

= -135

a)(-24)+6+10+24

=0+6+10

=16

b)15+23+(-25)+(-23)

=0+0

=0

c)(-3)+(-350)+(-7)+350

=0+(-3)+(-7)

=0

nhiều quá bạn chọn câu nào jhos nhất thôi

a, ( - 168 ) + 72 . ( - 168 ) + ( - 168 ) . 27

= ( - 168 ) + ( - 12096 ) + ( - 4536 )

= - 12264 + - 4536

= - 16800

b, 2² . ( - 3 ) - ( 1¹⁰ + 8 ) : ( - 3 )²

= 4 . ( - 3 ) - ( 1 + 8 ) : 9

= ( - 12 ) - 9 : 9

= ( - 12 ) - 1

= - 13

c, ( - 1075 ) - ( 29 - 1075 )

= ( - 1075 ) - ( - 1046 )

= - 29

d, ( - 9 ) + ( - 11 )  + 21 + ( - 1 )

= - 20 + 21 + ( - 1 )

= 1 + - 1

= 0

e, 30 + 12 + ( - 20 ) + ( - 12 ) - ( 30 - 20 ) + ( 12 - 12 ) 

= 42 + ( - 20 ) + ( - 12 ) - 10 + 0

= 22 + ( - 12 ) - 10 + 0

= 10 - 10 + 0

= 0 + 0

= 0

g, ( 13 - 135 + 49 ) - ( 13 + 49 )

= [( - 122 ) + 49  ] - 62

= ( - 73 ) - 62

= - 135

h, 35 - { 12 - [ ( - 14 ) + ( - 2 ) } ]

= 35 - { 12 - ( - 16 ) }

= 35 - 28

= 7

Bài 2:

a. x - 35 = ( - 12 ) - 3

    x - 35 = - 15

         x  = - 15 + 35

         x  = 20

b, \(\frac{1}{4}\)+ \(\frac{1}{3}\): 3x = - 5

\(\frac{3}{12}+\frac{4}{12}\): 3x = - 5

\(\frac{7}{12}\): 3x =  - 5

3x = \(\frac{7}{12}\): - 5

3x = \(\frac{-7}{60}\)

 x = \(\frac{-7}{60}\): 3

 x = \(\frac{-7}{180}\)

c,2^x-1 = 8

2^x-1 = 2⁴

x = 4 + 1

x = 5

Mình chữa lại phần c bài 2 nha:

2^x-1 = 8

2^x-1 = 2³

x = 3 + 1

x = 4

c) \(\dfrac{11}{10}-\dfrac{-7}{24}=\dfrac{11}{10}+\dfrac{7}{24}=\dfrac{167}{120}\)

e) \(\dfrac{-8}{3}\cdot\dfrac{15}{7}=\dfrac{-120}{21}=\dfrac{-40}{7}\)

f) \(\dfrac{-2}{5}\cdot4\dfrac{1}{2}=\dfrac{-2}{5}\cdot\dfrac{9}{2}=-\dfrac{9}{5}\)

g) \(\dfrac{5}{3}:\dfrac{5}{-3}=\dfrac{5}{3}:\dfrac{-5}{3}=\dfrac{5}{3}\cdot\dfrac{-3}{5}=-1\)

h) \(\dfrac{5}{4}:\left(-9\right)=\dfrac{5}{4}:\dfrac{-9}{1}=\dfrac{5}{4}\cdot\dfrac{-1}{9}=-\dfrac{5}{36}\)

Bài 89: Tính tổng :

a) (-24) + 6 + 10 + 24 = 16

b) 15 +23+( -25) +(-23) = -10

c) (-3) + ( -350 ) + (-7) + 350 = -10

d) ( -9 ) + ( -11 ) + 21 + ( -1) = 0

Bài 90: Đơn giản biểu thức:

a) x + 25 + ( -17 ) + 63 = x + 71

b) ( -75) – (p + 20 ) + 95 = -p

Bài 91: Tính nhanh các tổng sau:

a) (5674 – 97) – 5674 = 5674 - 97 - 5674 = -97

b) (-1075 ) – ( 29 – 1075 ) = -1075 - 29 + 1075 = -29

Bài 92: Bỏ dấu ngoặc rồi tính:

a) (18 +29 ) + ( 158 – 18 – 29 ) = 18 + 29 + 158 - 18 - 29 = 158

b) ( 13 – 135 + 49 ) – ( 13 +49) = 13 - 135 + 49 - 13 - 49 = - 135

Bài 92 ; a . (18+29)+(158-18-29) b . (13-135+49)-(13+49) = 18+29+158-18-29 = 13- 135+ 49 -13-49 = (-18+18)+(-29+29)+158 = (-13-13) + 49)-135 = 0 + 0 +158 = 0 + 0 -135 = 158 = -135

a, (-8)-(-12-8)=(-8)+12+8= [(-8)+8}]+12= 0+12=12

b, 1765-(312+1765)= 1765-312-1765=(1765-1765)-312=0-312=-312

c. (31-12)-(46+31-12)= 31-12+46-31+12= (31-31)+(12-12)+46=0+0+46=46

d, (5674-97)-5674=5674-97-5674=(5674-5674)-97=0-97=-97

e, (-1075)-(29-1075)=(-1075)+29+1075=[(-1075)+1075]+29=0+29=29

g, (18+29)+(158-18-29)=18+29+158-18-29=(18-18)+(29-29)+158=0+0+158=158

h, (13-135+49)-(13+49)=13-135+49-13-49=(13-13)+(49-49)-135=0+0-149=0-149=-149

Đáp Án

a)52:4x3+2x52

=13x3+2x52

=39+104

=143

b)5x42-18:32

=100-0.5625

=99.4375

của bạn nha