Question

a) Số?

b) Rút gọn các phân số: \(\dfrac{18}{24};\dfrac{56}{42};\dfrac{72}{90}\).

Answer 1

a)

\(\dfrac{24}{40}=\dfrac{12}{20}=\dfrac{3}{5}\)                        \(\dfrac{36}{54}=\dfrac{6}{9}=\dfrac{2}{3}=\dfrac{10}{15}\)

b) $\frac{{18}}{{24}} = \frac{{18:6}}{{24:6}} = \frac{3}{4}$

$\frac{{56}}{{42}} = \frac{{56:7}}{{42:7}} = \frac{8}{6} = \frac{4}{3}$

$\frac{{72}}{{90}} = \frac{{72:9}}{{90:9}} = \frac{8}{{10}} = \frac{4}{5}$