Question

Quy đồng mẫu số

3/5 và 4/7 ; 20/18 và 2/5 ; 5/6 và 3/4

 

Answer 1

a: \(\dfrac{3}{5}=\dfrac{3\times7}{5\times7}=\dfrac{21}{35};\dfrac{4}{7}=\dfrac{4\times5}{7\times5}=\dfrac{20}{35}\)

\(\dfrac{20}{18}=\dfrac{20\times5}{18\times5}=\dfrac{100}{90};\dfrac{2}{5}=\dfrac{2\times18}{5\times18}=\dfrac{36}{90}\)

\(\dfrac{5}{6}=\dfrac{5\times2}{6\times2}=\dfrac{10}{12};\dfrac{3}{4}=\dfrac{3\times3}{4\times3}=\dfrac{9}{12}\)

Answer 2

\(\dfrac{3\times7}{5\times7}=\dfrac{21}{35}\) ; \(\dfrac{4\times5}{7\times5}=\dfrac{20}{35}\)

\(\dfrac{20}{18}=\dfrac{10}{9}\) ; \(\dfrac{10\times5}{9\times5}=\dfrac{50}{45}\) ; \(\dfrac{2\times9}{5\times9}=\dfrac{18}{45}\)

\(\dfrac{5\times4}{6\times4}=\dfrac{20}{24}\) ; \(\dfrac{3\times6}{4\times6}=\dfrac{18}{24}\)

Answer 3

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