a)\(\frac{20}{11}.\frac{33}{23}.\frac{69}{180}=\frac{9}{9}=1\)

b: (675,98 + 888,66 + 111,34) x 0,01

= (675,98 + [888,66 + 111,34]) x 0,01

= (675,98 + 1000) x 0,01

= 1675,98 x 0,01

= 16,7598 

(675,98 + 888,66 + 111,34) x 0,01

= (675,98 + [888,66 + 111,34]) x 0,01

= (675,98 + 1000) x 0,01

= 1675,98 x 0,01

= 16,7598 

\(\frac{20}{11}\cdot\frac{33}{23}\cdot\frac{69}{180}\)

\(=\frac{20\cdot33\cdot69}{11\cdot23\cdot180}\)

\(=\frac{20\cdot3\cdot11\cdot23\cdot3}{11\cdot23\cdot20\cdot3\cdot3}\)

\(=1\)

bài b bạn xem lại đề nha

Dấu . là dấu nhân nha bạn

a) \(\frac{20}{11}.\frac{33}{23}.\frac{69}{180}=\frac{20.11.3.23.3}{11.23.20.3.3}=1\)

b) \(\left(675,98+888,66+111,34\right).9.0,01\)

    \(=\left(675,98+1000\right).9.0,01\)

    \(=1675,98.9.0,01=150,8382\)

Câu b bạn viết ko rõ lắm

\(\frac{20}{11}X\)\(\frac{33}{23}X\)\(\frac{69}{180}\)\(=\frac{20X11X3X23X3}{11X23X20X3X3}=\)\(1\)

TỚI CHỖ \(\frac{20X11X3X23X3}{11X23X20X3X3}\)THÌ BẠN GẠCH CHÉO NHỮNG SỐ GIỐNG NHAU NHA

20/11 x 33/23 x 23/60 = 20x33x23/11x23x60 = 1x3x1/1x1x3 = 3/3 = 1

a) \(\frac{20}{11}\cdot\frac{33}{23}\cdot\frac{69}{180}=\frac{20\cdot33\cdot69}{11\cdot23\cdot180}=\frac{2^2\cdot5\cdot3\cdot11\cdot23\cdot3}{11\cdot23\cdot2^2\cdot3^2\cdot5}=1\)

b) \(\left(675,98+888,66+111,34\right)\cdot0,01=1675,98\cdot0,01=16,7598\)

( 23 + 47) + (11 + 49) = 50 + 50 = 100

(4. 25) . (7 . 11) = 100 . 77 = 7700

23 + 47 + 11 + 49

=( 23 + 47 ) + (11+49)

= 70+60

=130

4.7.11.25

= (4.25) . (7.11)

=100 . 77

= 7700

k mình nha bn

\(23+47+11+49\)

\(=\left(23+47\right)+\left(11+49\right)\)

\(=70+60\)

\(=130\)

\(4.7.11.25\)

\(=\left(4.25\right).\left(7.11\right)\)

\(=100.77\)

\(=7700\)

2x25x50xx8=(25x8)x(50x2)=200x100=20000

12x11+21x11+11x33=11x(12+21+33)=11x66=726

2*25*50*8

=(2*50)*(25*8)

=100*200=20000

12*11+21*11+11*33

=11*(12+21+33)

=11*66=676

2 x 25 x 50 x 8  = (8 x 25) x (50 x 2) = 200 x 100 = 20000

b) 12 x 11 + 21 x 11 + 11 x 13 = 11 x (12 + 21 + 33) 

= 11 x 66 = 726

23+47+11+49

=(23+47)+(11+49)

=    70    +   60

=          130

4.7.11.25

=(4.25).(7.11)

=  100 .  77

=     7700

5.9.3.2

=(5.2).(3.9)

=   10.  27

=     270

23+47+11+49 = 70 + 60 = 130

4.7.11.25 = 4 . 25 . 7 . 11 = 100 x 77 = 7700

5.9.3.2 = 5 x 2 x 3 x 2 = 10 x 6 = 60 

\(23+47+11+49\)

\(=\left(23+47\right)+\left(11+49\right)\)

\(=70+60\)

\(=130\)

\(4x7x11x25\)

\(=\left(4x25\right)x\left(7x11\right)\)

\(=100x77\)

\(=7700\)

\(5x9x3x2\)

\(=\left(5x2\right)x\left(9x3\right)\)

\(=10x27\)

\(=270\)

K mình nha mình nhanh nhất đó!

\(\frac{20}{11}\times\frac{33}{23}\times\frac{69}{180}\)

 = \(\frac{20}{11}\times\frac{33}{23}\times\frac{69}{180}=\frac{20\times33\times69}{11\times23\times180}\)\(=\frac{1\times3\times3}{1\times1\times9}=\frac{9}{9}=1\)

k mk nha Nguyễn Lê Tiểu Long

20*33*69=20*11*3*23*3=3*3=9

11*23*180=11*23*20*9=9=9

=1

=(1.25-1.25)-(6.75-6.75)+11x65+11x3x5

=0-0+11x(65-15)

=11x50

=550

   1.25 - 6.75 + 6.75 + 11 x 65 -1.25+33 x 5

=(1.25-1.25)+(6.75-6.75)+11.65+11.3.5

=0+0+11.65+11.(3.5)

=11.65+11.15

=11.(65+15)

=11.80

=880

Bạn "Frisk" sai dấu nha,dòng 3