\(\frac{6}{35}=\frac{1}{5}\div\frac{7}{6}\)

\(\frac{6}{35}=\frac{1}{7}\div\frac{5}{6}\)

\(\frac{6}{35}=\frac{2}{7}\div\frac{5}{3}\)

\(\frac{6}{35}=\frac{3}{7}\div\frac{5}{2}\)

\(\frac{6}{35}\)= \(\frac{1}{7}\)/ \(\frac{5}{6}\)=\(\frac{2}{7}\)/ \(\frac{5}{3}\)=\(\frac{6}{7}\)/ \(\frac{5}{1}\)= \(\frac{3}{7}\)/ \(\frac{5}{2}\)

ĐƯƠC VIẾT DƯỚI DẠNG  8 pHÂN SỐ:

2/5/7/3

1/5/7/6

3/5/7/2

6/5/7

2/7/5/3

1/7/5/6

3/7/5/2

6/7/5
 

Ta có: 14/15= 2/3: 5/7 hoặc 14/15= 2/5:3/7=7/3: 5/2=7/5:3/2

\(\dfrac{14}{15}=\dfrac{2\cdot7}{5\cdot3}=\dfrac{2}{5}\cdot\dfrac{7}{3}=\dfrac{2}{5}:\dfrac{3}{7}\)

Ta có: 14/15= 2/3: 5/7 hoặc 14/15= 2/5:3/7=7/3: 5/2=7/5:3/2

a ) 8 21 = 1 3 : 7 8 = 8 7 : 3 1 = 1 7 : 3 8 = 2 3 : 7 4 = 4 7 : 3 2 = 2 7 : 3 4 = 4 3 : 7 2

b)

8 21 = − 1 3 : 7 8 = − 8 7 : − 3 1 = − 1 7 : − 3 8 = − 2 3 : 7 4 = − 4 7 : 3 2 = − 2 7 : − 3 4 = − 4 3 : − 7 2

cưc dễ