Đáp án + giải thích các bước giải:

`a)` `2/5=(2xx3)/(5xx3)=6/15.`

`4/9=(4xx2)/(9xx2)=8/18.`

`b)` `5/8=(5xx4)/(8xx4)=20/32.`

`6/8=(6:2)/(8:2)=3/4.`

`c)` `15/35=(15:5)/(35:5)=3/7.`

`54/45=(54:9)/(45:9)=6/5.`

`d)` `2/3=4/6.`

`18/60=3/10.`

`56/32=7/4.`

`3/4=12/16.`

$\text{#TokitouMuichiroucute}$

Đáp án + Giải thích các bước giải:

a) $\dfrac{2}{5}$ = $\dfrac{2x3}{5x3}$ = $\dfrac{6}{15}$ 

    $\dfrac{4}{9}$ = $\dfrac{4x2}{9x2}$ = $\dfrac{8}{18}$

b) $\dfrac{5}{8}$ = $\dfrac{5x4}{8x4}$ = $\dfrac{20}{32}$

    $\dfrac{6}{8}$ = $\dfrac{6:2}{8:4}$ = $\dfrac{3}{4}$

c) $\dfrac{15}{35}$ = $\dfrac{15:5}{35:5}$ = $\dfrac{3}{7}$

    $\dfrac{54}{45}$ = $\dfrac{54:9}{45:9}$ = $\dfrac{6}{5}$

d) $\dfrac{2}{3}$ = $\dfrac{4}{6}$

    $\dfrac{18}{60}$ = $\dfrac{3}{10}$

    $\dfrac{3}{4}$ = $\dfrac{12}{16}$