2 câu trả lời
$\dfrac{5}{36}$ + $\dfrac{5}{9}$
= $\dfrac{5}{36}$ + $\dfrac{20}{36}$
=$\dfrac{25}{36}$
$\dfrac{11}{4}$ + $\dfrac{15}{16}$
= $\dfrac{44}{16}$ + $\dfrac{15}{16}$
= $\dfrac{59}{16}$
$\dfrac{1}{7}$ + $\dfrac{25}{49}$
= $\dfrac{7}{49}$ + $\dfrac{25}{49}$
= $\dfrac{32}{49}$
`5/36+5/9`
`=` `5/36+20/36`
`=` `25/36`
`11/4+15/16`
`=` `44/16+15/16`
`=` `59/16`
`1/7+25/49`
`=` `7/49+25/49`
`=` `32/49`