\(\dfrac{14}{21}=\dfrac{7\cdot2}{7\cdot3}=\dfrac{2}{3}\)

\(\dfrac{-36}{48}=\dfrac{-12\cdot3}{12\cdot4}=-\dfrac{3}{4}\)

\(\dfrac{28}{-52}=\dfrac{7\cdot4}{-4\cdot13}=-\dfrac{7}{13}\)

\(\dfrac{-54}{-90}=\dfrac{-18\cdot3}{-18\cdot5}=\dfrac{3}{5}\)

\(\dfrac{14}{21}\) =\(\dfrac{2}{3}\)

\(\dfrac{-36}{48}\) =\(\dfrac{3}{4}\)

\(\dfrac{28}{-52}\)=\(\dfrac{7}{-13}\)

\(\dfrac{-54}{-90}\) =\(\dfrac{6}{9}=\dfrac{2}{3}\)

\(\dfrac{14}{21}=\dfrac{2}{3}\)

\(\dfrac{-36}{48}=-\dfrac{3}{4}\)

\(\dfrac{28}{-52}=-\dfrac{7}{13}\)

\(\dfrac{-54}{-90}=\dfrac{3}{5}\)

11/12=1/2 , 36/10=18/5 , 75/36 = 25/12 , 14/28 = 1/2 , 48/30 = 8/5

1/2;18/5;25/12;1/2;24/15

\(\dfrac{11}{22}\)=\(\dfrac{1}{2}\)

\(\dfrac{36}{10}\)=\(\dfrac{18}{5}\)

\(\dfrac{75}{36}\)=\(\dfrac{25}{12}\)

\(\dfrac{14}{28}\)=\(\dfrac{1}{2}\)

\(\dfrac{48}{30}\)=\(\dfrac{8}{5}\)

14/21=2/3; -36/48=-2/3

28/-52=-7/13; -54/-90=3/5

-21/39=-7/13

-21/39=-7/13=-14/26=-21/39=-28/52=-35/65=-42/78=-48/91

`14/21=2/3`

`(-36)/48=-3/4`

`28/(-52)=-7/13`

`(-54)/(-90)=3/5`

`(-21)/39=-7/13`

128.0922313

tik nha!

Cái này mình học qua nhưng quên mất rồi. Năm nay mình học lớp 11 rồi mà bài này tận lớp 6 sao mình nhớ nổi nhắc đến là mình muốn banh cả não luôn đó 

        Đoán đại nha: 128.0922313 đúng không nếu đúng  nha, mình cũng không chắc cho lắm???????????^^!!!!!!!!!!!!

\(\dfrac{5}{15}+\dfrac{48}{16}=\dfrac{1}{3}+3=\dfrac{1}{3}+\dfrac{9}{3}=\dfrac{10}{3}\)

\(\dfrac{6}{9}:\dfrac{12}{36}=\dfrac{2}{3}:\dfrac{1}{3}=\dfrac{2}{3}\times\dfrac{3}{1}=\dfrac{6}{3}=2\)

\(\dfrac{4}{12}\times\dfrac{56}{14}=\dfrac{1}{3}\times4=\dfrac{4}{3}\)

bạn ngọc hân đúng rồi

10693,28571

A=7.9+7.9.2.3+7.9.3.4/21.27+21.27.2.3+21.27.3.4

  =7.9(1+2.3+3.4)/21.27(1+2.3+3.4)

  =7.9/21.27

  =7.9/7.9.3.3

  =1/9

M = 7 .9 + 14. 27 + 21 . 36 / 21 . 29 + 42 . 81 + 63 . 108 = 7 . 9 (1 + 2.3 + 3.4) / 21( 29 + 2 . 81 + 3 . 108) = 3 . 19 / 29 + 3⁴ . (2 + 2²) = 3 . 19 / 29 + 3⁴ . 6 = 57 / 515