Question

Answer 1

30/45=2/3

4/6=2/3

12/8=3/2

15/25=3/5

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Answer 2

Bài 1)

\(a,\dfrac{2}{3};\dfrac{2}{3};\dfrac{3}{2};\dfrac{3}{5}\\ b,\dfrac{6}{7};\dfrac{1}{2};\dfrac{13}{5};\dfrac{25}{13}\\ c,\dfrac{4}{9};\dfrac{1}{2};\dfrac{1}{3};\dfrac{1}{8}\\ d,\dfrac{13}{17};\dfrac{5}{12};\dfrac{3}{7};\dfrac{1}{25}\) 

Bài 2)

\(a,\dfrac{5}{9};\dfrac{7}{19}\\ b,\dfrac{26}{54}=\dfrac{13}{27};\dfrac{11}{22}=\dfrac{1}{2};\dfrac{21}{36}=\dfrac{7}{13}\)