\(\dfrac{4.4.2.5.5.2}{5.5.4.4.2}=2\)

\(\dfrac{2.2.3.11}{3.11.2.2.6}=\dfrac{1}{6}\)

\(\dfrac{2.3.5}{2.5.7}=\dfrac{3}{7}\)

\(\dfrac{2}{9}=\dfrac{2.7}{9.7}=\dfrac{14}{63}\)

\(\dfrac{5}{7}=\dfrac{5.9}{7.9}=\dfrac{45}{63}\)

\(\dfrac{24}{32}=\dfrac{24:8}{32:8}=\dfrac{3}{4}\)

\(\dfrac{75}{100}=\dfrac{75:25}{100:25}=\dfrac{3}{4}\)

\(\dfrac{45}{60}=\dfrac{45:15}{60:15}=\dfrac{3}{4}\)

\(\dfrac{27}{63}=\dfrac{27:9}{63:9}=\dfrac{3}{7}\)

 \(6\) x \(8\) x \(\dfrac{15}{24}\) x \(12\) x \(5\) \(=1800\)

\(\dfrac{6.8.15}{24.12.5}=\dfrac{6.4.2.5.3}{4.6.6.2.5}=\dfrac{1}{2}\)

\(\dfrac{13}{17}< \dfrac{30}{34}\)                                        \(\dfrac{9}{8}>\dfrac{5}{7}\) 

 \(\dfrac{15}{7}< \dfrac{8}{3}\)                                        \(\dfrac{5}{7}< \dfrac{7}{5}\)                     

\(\dfrac{16}{20}=\dfrac{4}{5}\)

\(13dm^29cm^2=1309cm^2\)

25 km vuông nha

Đáp án là: 25 km vuông

a. Quy đồng mẫu số thứ 2 ta có: 

\(\dfrac{7}{5}=\dfrac{7.3}{5.3}=\dfrac{21}{15}\)

\(\Rightarrow\dfrac{8}{15}< \dfrac{7}{5}\)

b. 2 phân số có cùng tử số, phân số nào có mẫu lớn hơn thì nhỏ hơn

\(\dfrac{9}{5}< \dfrac{9}{2}\)

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