\(2,\\ a,1,5:2=3:4\\ b,\dfrac{2}{7}:\dfrac{3}{5}=\dfrac{2}{7}\cdot\dfrac{5}{3}=\dfrac{10}{21}=10:21\\ c,\dfrac{2}{9}:0,3=\dfrac{2}{9}:\dfrac{3}{10}=\dfrac{2}{9}\cdot\dfrac{10}{3}=20:27\\ d,3:0,2=15:10\)
\(3,\\ a,\Rightarrow\dfrac{7}{4}=\dfrac{-49}{-28};\dfrac{7}{-49}=\dfrac{4}{-28};\dfrac{-28}{4}=\dfrac{-49}{7};\dfrac{-28}{-49}=\dfrac{4}{7}\\ b,\Rightarrow\dfrac{0,6}{0,7}=\dfrac{3,6}{4,2};\dfrac{4,2}{3,6}=\dfrac{0,7}{0,6};\dfrac{4,2}{0,7}=\dfrac{3,6}{0,6}\)
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