\(\frac{4}{5}\cdot\frac{3}{7}+\frac{4}{5}\cdot\frac{6}{7}-\frac{4}{5}\cdot\frac{4}{14}\)

\(=\frac{4}{5}\cdot\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{14}\right)\)

\(=\frac{4}{5}\cdot1=\frac{4}{5}\)

                                                                     #Louis

Vì 1/6,5 = 10/65 và 7/5 = 91/65. Mà 10/65 < 91/65

=> 1/6,5 < 7/5

1/6,5 bé hơn vì nó bé hơn 1 còn 7/5 lớn hơn 1

Ta có 19/18=1+1/18

        2005/2004=1+1/2004

Vì 1/18>1/2004 nên 1+1/18 >1/2004 +1 hay 19/18>2005/2004

1. Ta có: \(\frac{19}{18}>\frac{18}{18}=1=\frac{2005}{2005}>\frac{2004}{2005}\)

hay: 19/18 > 1 > 2004/2005

Vậy 19/18 > 2004/2005

2. \(\frac{3}{6}=\frac{1}{2}=\frac{7}{14};\frac{2}{7}=\frac{4}{14};\frac{4}{7}=\frac{8}{14}\)

Vì 4/14 < 7/14 < 8/14

nên: 2/7 < 3/6 < 4/7.

3. \(\frac{12}{25};\frac{9}{5}=\frac{45}{25};\frac{3}{5}=\frac{15}{25};\frac{1}{25}\)

Vì 45/25 > 15/25 > 12/25 > 1/25

nên: 9/5 > 3/5 > 12/25 > 1/25

4. \(\frac{35}{42}+\frac{14}{42}=\frac{35+14}{42}=\frac{49}{42}\)

5. \(\frac{6}{16}+\frac{32}{16}=\frac{6+32}{16}=\frac{38}{16}=\frac{19}{8}\).

\(3\frac{1}{2}+4\frac{5}{7}-5\frac{5}{14}=\frac{7}{2}+\frac{33}{7}-\frac{75}{14}=\frac{49}{14}+\frac{66}{14}-\frac{75}{14}=\frac{40}{14}=\frac{20}{7}\)

#Fox

????????????????????????????????????!?¿??¿???¿??????????¿??¿?????????????????????

4/5 : 3/7 : 2/9 = 4/5 x 7/3 x 9/2

                     =   42/5

457 / 315

bai toan @gmail.com

5/3 < a < 5/7 : 1/3 

1,66666.....< a < 17/7

1,66666.....< a < 2,42............

vậy a=2 

11/14 bạn nhé

\(\frac{11}{14}\)

a)\(\dfrac{7}{19}\)
b)\(\dfrac{9}{10}\)
c)\(\dfrac{17}{23}\)
d)\(\dfrac{25}{58}\)