Đáp án:Giải thích các bước giải:
ta có :
$\dfrac{25}{30}=$ $\dfrac{25:5}{30:5}=$ $\dfrac{5}{6}$
$\dfrac{15}{45}=$ $\dfrac{15:15}{45:15}=$ $\dfrac{1}{3}$
quy đồng :
mẫu số chung : 24
$\dfrac{5}{8}=$ $\dfrac{5.3}{8.3}=$ $\dfrac{15}{24}$
$\dfrac{5}{6}=$ $\dfrac{5.4}{6.4}=$ $\dfrac{20}{24}$
$\dfrac{1}{3}=$ $\dfrac{1.8}{3.8}=$ $\dfrac{8}{24}$
$\text{This is the homework of chanhannho9509 . }$