Làm nhanh nhé giúp mình nhé . Rút gọn phân số . 7/21 . 12/15 . 36/72. 28/36.16/36.8/10.16/20.50/100.25/200.100/250. Nhanh nhất 5 sao và được hay nhất nhé. Thanks

$#taik$

Rút gọn phân số

$\dfrac{7}{21}$ $=$ $\dfrac{7:7}{21:7}$ $=$ $\dfrac{1}{3}$

$\dfrac{12}{15}$ $=$ $\dfrac{12:3}{15:3}$ $=$ $\dfrac{4}{5}$

$\dfrac{36}{72}$ `=` $\dfrac{36:36}{72:36}$ `=` $\dfrac{1}{2}$

$\dfrac{28}{36}$ `=` $\dfrac{28:4}{36:4}$ `=` $\dfrac{7}{9}$

$\dfrac{16}{36}$ `=` $\dfrac{16:4}{36:4}$ `=` $\dfrac{4}{9}$

$\dfrac{8}{10}$ `=` $\dfrac{8:2}{10:2}$ `=` $\dfrac{4}{5}$

$\dfrac{16}{20}$ `=` $\dfrac{16:4}{20:4}$ `=` $\dfrac{4}{5}$

$\dfrac{50}{100}$ `=` $\dfrac{50:50}{100:50}$ `=` $\dfrac{1}{2}$

$\dfrac{25}{200}$ `=` $\dfrac{25:25}{200:25}$ `=` $\dfrac{1}{8}$

$\dfrac{100}{250}$ `=` $\dfrac{100:50}{250:50}$ `=` $\dfrac{2}{5}$