$#Shun$

Bài 1: Tính:

`a) 2/3+4/5`

`= 10/15+12/15`

`=22/15`

`b) 23/10 - 3/5`

`= 23/10 - 6/10`

`=17/10`

`c) 6+5/6`

`= 36/6 +5/6`

`= 41/6`

`d) 15/6 - 2`

`=15/6- 12/6`

`= 3/6 = 1/2`

`e) 3/4` x `5/6`

`=15/24`

`=5/8`

`g) 8/5 : 1/3`

`= 8/5` x `3/1`

`= 24/5`

`i) 3/7 : 2`

`= 3/7` x `1/2`

`=3/14`

`k) 4/5` x `15`

`= 4/5` x `15/1``= 20/5 = 4`

$\frac{2}{4}$ + $\frac{4}{5}$ = $\frac{22}{15}$                 $\frac{23}{10}$ - $\frac{3}{5}$ = $\frac{17}{10}$

`\text{6}` + $\frac{5}{6}$ = $\frac{41}{6}$                         $\frac{15}{6}$ - `\text{2}` = $\frac{1}{2}$ 

$\frac{3}{4}$ x $\frac{5}{6}$ = $\frac{5}{8}$                      $\frac{8}{5}$ : $\frac{1}{3}$ = $\frac{24}{5}$ 

$\frac{3}{7}$ : `\text{2}` = $\frac{3}{14}$                           $\frac{4}{5}$ x `\text{15}` = $\frac{12}{1}$