= 72 . 28 -72. 49 + 28. (-49)-28.72 

= 72.28 - 28 . 72 - 72 . 49 + 28 . (-49)

= 0  - 72 . 49 + 28 . ( -49  )

= -72 .49 + 28 . ( -49)

= 72 . ( -49) + 28 . (-49)

= (72+28) .(-49)

=  100 . (-49)

= -4900

k mình nha !

-​4900

=(72+28)x-49

=-4900

28 x 47 + 28 x 43 + 72 x 29 + 72 x 61

= 28 x ( 47 + 43 ) + 72 x ( 29 + 61)

= 28 x 90 + 72 x 90

= 90  x ( 28 + 72)

= 90 x 100

= 9 000

k mk nha

28 x 47 + 28 x 43 + 72 x 29 + 72 x 61

= 28 x (47 + 43) + 72 x (29 + 61)

= 28 x 90 + 72 x 90

= (28 + 72) x 90

= 100 x 90 = 9000

     28 x 47 + 28 x 43 + 72 x 29 + 72x 61

= 28( 47 + 43 ) + 72 x ( 61+ 29)

=28 x 90 + 72 x 90

= 90 x (28 + 72 )

= 90 x 100 = 9000

\(\left(72.72+72.28\right)+x:8\)

\(\left[72.\left(72+28\right)\right]+x:8\)

\(\left(72.100\right)+x:8\)

\(7200+x:8\)

\(x:8=-7200\)

\(x=-57600\)

vậy \(x=-57600\)

57600 nha ban

a. \(\frac{4}{25}\times72+\frac{4}{25}\times28=\frac{4}{25}\times\left(72+28\right)=\frac{4}{25}\times100=4\times4=16\)

b.\(0.5\times72+\frac{3}{6}\times28=0.5\times72+0.5\times28=0.5\times\left(72+28\right)=0.5\times100=50\)

a) 4/25 × 72 + 4/25 × 28

= 4/25 × (72+28)

= 4/25 × 100

= 16/100 × 100

= 16

b) 0.5 × 72 + 3/6 × 28

= 5/10 × 72 + 3/6 × 28

= 1/2 × 72 + 1/2 × 28

= 1/2 × (72 + 28)

= 1/2 × 100

= 5/10 × 100

= 50

\(\left(72-152+28\right)-\left(-52+128+72\right)\)

\(=\left(-52\right)-148=-200\)

bùi thiên lương giải chi tiết ra cho mik rồi mik k nha

mik k nha

B đúng

C sai

D đúng

true

đún

45-58+(-45)+(+58)-3=45-58-45+58-3=(45-45)+(58-58)-3=-3

(-57)-(-12)+3-(-57)=-57+12+3+57=(-57+57)+12+3=15

-(-24)-(-30)+(-24)-30+8=24+30-24-30+8=(24-24)+(30-30)+8=8

-(-12)+(+19)-(+12)+8-19=12+19-12+8-19=(12-12)+(19-19)+8=8

47-(-53)+(-47)-(+53)=47+53-47-53=(47-47)+(53-53)=0

-(+28)+32-(-28)+(-34)=-28+32+28-34=(-28+28)-(34-32)=-2

15-(+72)+(-15)+(+72)=15-72-15+72=(15-15)+(72-72)=0

20-(+46)+(-25)-(-46)=20-46-25+46=(20-25)+(46-46)=-5

28-(-32)+(-28)-32+5=28+32-28-32+5=(28-28)+(32-32)+5=5

-75+(-49)+(+75)+49-12=-75-49+75+49-12=(-75+75)+(49-49)-12=-12

\(...=45-58-45+58-3=-3\)

\(...=-57+12+3+57=15\)

\(...=24+30-24-30+8=8\)

\(...=12+19-12+8-19=8\)

\(...=47+53-47-53=0\)

\(...=-28+32+28-34=-2\)

\(...=15-72-15+72=0\)

\(...=20-46-25+46=-5\)

\(=...28+32-28-32+5=5\)

\(...=-75-49+75+49-12=-12\)

A)

  -65.(87-17)-87.(17-65)

=-65.87-(-65).17-87.17-87.(-65)

=-(-65).17-87.17

=65.17-87.17

=17.(65-87)

=17.(-22)

=-374

B)

   72.(28-49)+28.(-49-72)

= 72.28-72.49+28.(-49)-28.72

= -72.49+28.(-49)

=  72.(-49)+28.(-49)

=  (-49).(72+28)

=  -49.100

=-4900

C)

18-(-27)+63-(63+27)

=  18+27+63-63-27

=  45+0-27

=  45+(-27)

=45-27

=18

KICK MÌNH NHÁ

Viết rõ ràng chi tiết hộ mik nhé

72.(28 - 49) + 28.(-49 - 72)

= 72.28 - 72.49 + 28.(-49) - 28.72

= (72.28 - 28.72) - [72.49 - 28.(-49)

= 0 - [(-72)(-49) - 28.(-49)]

= 0 - [(-49).(-72 - 28)]

= 0 - [(-49).(-100)]

= 0 - 4900

= -4900

72.(28-49)+28.(-49-72)=72.28-72.49+28.(-49)-28.72

=72.28-28.72+28.(-49)-(-72).49

=72.28-28.72+28.(-49)-(-49).72

=72.(28-28)+(-49).(28+72)

=0+(-49).100

=-4900

Củ là gì?