Đáp án:
$\dfrac{15}{40}=\dfrac{3}{8}$
$\dfrac{21}{39}=\dfrac{7}{13}$
$\dfrac{16}{24}=\dfrac{2}{3}$
$\dfrac{36}{72}=\dfrac{1}{2}$
$\dfrac{24}{1000}=\dfrac{3}{125}$
Giải thích các bước giải:
$\dfrac{15}{40}=\dfrac{15:5}{40:5}=\dfrac{3}{8}$
$\dfrac{21}{39}=\dfrac{21:3}{39:3}=\dfrac{7}{13}$
$\dfrac{16}{24}=\dfrac{16:8}{24:8}=\dfrac{2}{3}$
$\dfrac{36}{72}=\dfrac{36:36}{72:36}=\dfrac{1}{2}$
$\dfrac{24}{1000}=\dfrac{24:8}{1000:8}=\dfrac{3}{125}$
