`a, 35% : 10/3`

`= 7/20 . 3/10`

`= ( 7 . 3 )/( 20 . 10 )`

`= 21/200`

`b, 1 2/7 : 5/14`

`= 9/7 . 14/5`

`= ( 9 . 14 )/( 7 . 5 )`

`= 18/5`

`c, 3 1/2 : 4 1/4`

`= 7/2 : 17/4`

`= ( 7 . 17 )/( 2 . 4 )`

`= 119/8`

`d, 27% : 1 3/7`

`= 27/100 : 10/7`

`= 27/100 . 7/10`

`= ( 27 . 7 )/( 100 . 10 )`

`= 189/1000`

Lời giải chi tiết 

a ) 35 % : $\frac{10}{3}$ 

= $\frac{7}{20}$ : $\frac{10}{3}$ 

= $\frac{7}{20}$ x $\frac{3}{10}$ 

= $\frac{21}{200}$ 

b ) 1$\frac{2}{7}$ : $\frac{5}{14}$ 

= $\frac{9}{7}$ : $\frac{5}{14}$ 

= $\frac{9}{7}$ x $\frac{14}{5}$ 

= $\frac{18}{5}$ 

c ) 3$\frac{1}{2}$ : 4$\frac{1}{4}$ 

= $\frac{7}{2}$ : $\frac{17}{4}$ 

= $\frac{7}{2}$ x $\frac{4}{17}$ 

= $\frac{14}{17}$ 

d ) 27 % : 1$\frac{3}{7}$ 

= $\frac{27}{100}$ : $\frac{10}{7}$ 

= $\frac{27}{100}$ x $\frac{7}{10}$ 

= $\frac{189}{1000}$ 

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