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

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

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

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

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

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

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

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

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

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

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

Ai nhanh mk tick cho

tui 

a: =17/25(13/19+6/19)=17/25

b: \(=\dfrac{47}{19}\cdot\dfrac{32}{15}-\dfrac{47}{19}\cdot\dfrac{17}{15}=\dfrac{47}{19}\)

`17/25xx(13/19+6/19)`

`17/25xx1`

`17/25`

`a)17/25xx13/19+17/25xx6/19`

`=17/25xx(13/19+6/19)`

`=17/25xx19/19=17/25`

`b)47/19:15/32-47/19:15/17`

`=47/19xx32/15-47/19xx17/15`

`=47/19xx(32/15-17/15)`

`=47/19xx15/15=47/19`

=100000-(47.(75+24+1)       b)    =276.(50+36+4)

=100000-4700                              =276.90

=95300                                         =24840

\(100000-\left(47.75+47.24+47\right)\)

\(=100000-\left(47.75+47.24+47.1\right)\)

\(=100000-\left[47.\left(75+24+1\right)\right]\)

\(=100000-47.100\)

\(=100000-47000\)

\(=53000\)

\(276.50+276.36+1104\)

\(=276.50+276.36+276.4\)

\(=276.\left(50+36+4\right)\)

\(=276.90\)

\(=24840\)

100000-(47.75+47.24+47)

=100000-[47.(75+24+1)]

=100000-[47.(99+1)]

=100000-[47.100]

=100000-4700

=96300

276x50+276x36+1104

=276(50+36)+276.4

=276.86+276.4

=276.(86+4)

=276.90

=24840

= 47x(86-76) + 10x13-3x10+ (4x25) x19

= 47x10 + 10x (13-3) + 100x19

=470 + 100+1900=2470

tick mình cho tròn 240 với

\(19.27+47.51+19.20+47.30\)

\(=19.\left(27+20\right)+47.\left(51+30\right)\)

\(=19.47+47.81=47.\left(19+81\right)\)

\(=47.100=4700\)

Chúc bạn học tốt!!!

\(19.27+47.51+19.20+47.30\)

\(=19.\left(27+20\right)+47.\left(51+30\right)\)

\(=19.47+47.81\)

\(=47.\left(19+81\right)\)

\(=47.100\)

\(=4700\)

a) tích bằng 0 <=> một trong 2 thừa số băng 0

=> x-34=0

=> x=34

b) tích bằng một thừa số <=> thừa sô kia bằng 1

=> 47-x=1

        x = 46

k nha

(x - 34 ) x 75 = 0

x - 34 = 0

x = 34

(47 - x ) x 54 = 54

47 - x = 1

x = 46

a)(x-34).75=0

x-34=0/75

x-34=0

x=34+0

x=34

b)(47-x).54=54

47-x=54/54

47-x=1

x=47-1

x=46

\(\frac{x}{3}-\frac{x}{6}=\frac{47}{4}-\frac{19}{4}\)

\(\frac{2x}{6}-\frac{x}{6}=7\)

\(\frac{x}{6}=7\)

x = 7.6 = 42

a) (x + 729) x 38 = 54226

x + 729 = 54226 : 38

x + 729 = 1427

x = 1427 - 729

x = 698

b) (1862 - x) x 26 = 38714

1862 - x = 38714 : 26

1862 - x = 1489

x = 1862 - 1489

x = 373

c) 49203 : (x - 47) = 63

x - 47 = 49203 : 63

x - 47 = 781

x = 781 + 47

x = 828

d) 10266 - (x + 75) = 29

x + 75 = 10266 - 29

x + 75 = 10237

x = 10237 - 75

x = 10162