`29 xx 20,22 + 15 xx 20,22 + 20,22 xx 44 + 24 xx 10,11`

`= 20,22 xx (29 + 15 + 44 + 12)`

`= 20,22 xx 100`

`= 2022`

C1 : 29 x 20,22 + 15 x 20,22 + 20,22 x 44 + 24 x 10,11

= 29 x 20,22 + 15 x 20,22 + 20,22 x 44 + 12 x (2 x 10,11)

= 29 x 20,22 + 15 x 20,22 + 20,22 x 44 + 12 x 20,22

= 20,22 x 100

= 2022

C2: 29 x 20,22 + 15 x 20,22 + 20,22 x 44 + 24 x 10,11

= 20,22 x ( 29 + 15 + 44 + 12 )

= 20,22 x 100

= 2022

\(\dfrac{7}{5}\times\dfrac{11}{24}\times\dfrac{5}{7}\times\dfrac{24}{55}\\ =\left(\dfrac{7}{5}\times\dfrac{5}{7}\right)\times\left(\dfrac{11}{24}\times\dfrac{24}{55}\right)\\ =1\times\dfrac{1}{5}\\ =\dfrac{1}{5}\)

\(\dfrac{7x11x5x24}{5x24x7x55}\)=\(\dfrac{11}{55}\)=\(\dfrac{1}{5}\)

= (7/5 x 5/7) x (11/24 x 24/55)

= 1 x 1/5

= 1/5

a) (25x32) : 8           

= 25 x (4 x 8) : 8

= (25 x 4) x (8:8)

= 100 x 1

=100

b, 24 x 11 + 6 x 86 x 4 + 72

= 24 x 11 + (6 x 4) x 86 + 24 x 3

= 24 x 11 + 24 x 86 + 24 x 3

= 24 x (11+86+3)

= 24 x 100

= 2 400

\(\left(25\times32\right):8=25\times32:8=25\times\left(32:8\right)=25\times4=100\\ 24\times11+6\times86\times4+72\\ =24\times11+24\times86+24\times3\\ =24\times\left(11+86+3\right)\\ =24\times100=2400\\ 36\times5+9\times79\times4+72\times8\\ =36\times5+36\times79+36\times16\\ =36\times\left(5+79+16\right)\\ =36\times100=3600\\ \left(56\times125\right):7=56\times125:7=\left(56:7\right)\times125=8\times125=1000\)

\(\frac{5x8x24x27}{8x15x9x7}=\frac{5x8x24x9x3}{8x5x3x9x7}=\frac{24}{7}\)

Chúc bạn học tốt.

😁😁😁

Ta tính thuận tiện bằng cách phân tích các thừa số để bỏ thừa số chung:

\(\frac{5\text{x}8\text{x}24\text{x}27}{8\text{x}15\text{x}9\text{x}7}=\frac{5\text{x}8\text{x}3\text{x}8\text{x}3\text{x}3\text{x}3}{8\text{x}3\text{x}5\text{x}3\text{x}3\text{x}7}\)

\(=\frac{8\text{x}3}{7}\)

\(=\frac{24}{7}\)

=9/4x2/3+16/9x4/3

=18/12+64/36

=54/36+64/36=118/36=59/18

 36/16 x 12/18 + 32/18 x 24/18 

\(=\dfrac{9}{4}\times\dfrac{2}{3}+\dfrac{16}{9}\times\dfrac{4}{3}\)

\(=\dfrac{3}{2}+\dfrac{64}{27}\)

\(=\dfrac{209}{54}\)

13/19 x 23/11 - 13/19 x 8/11 - 13/19 x 4/11

= 13/19 x (23/11 - 8/11 - 4/11)

= 13/19 x 1

= 13/19

\(\dfrac{13}{19}\times\dfrac{23}{11}-\dfrac{13}{19}\times\dfrac{8}{11}-\dfrac{13}{19}\times\dfrac{4}{11}\\ =\dfrac{13}{19}\times\left(\dfrac{23}{11}-\dfrac{8}{11}-\dfrac{4}{11}\right)\\ =\dfrac{13}{19}\times1=\dfrac{13}{19}\)

câu b, 20/5x7 + 20/7x9 + 20/ 9 x11 + ..... 20 / 33 x35

nhiều thế

sfdhg 

= 24 : 0,5 + 24 x 8 

= 24 x 2 + 24 x 8 

= 24 x ( 2 + 8 )

= 24 x 10

= 240

Nhớ k cho mik nhé