a: \(=3+\dfrac{4}{9}\cdot\dfrac{25}{7}\cdot\dfrac{7}{25}\cdot\dfrac{9}{4}-\dfrac{7}{25}\)
=3+1-7/25=4-7/25=93/25
b: \(=\dfrac{5}{10}\cdot\dfrac{7}{14}\cdot\dfrac{9}{18}\cdot\dfrac{11}{22}\cdot\dfrac{13}{26}\cdot\dfrac{15}{30}\)
=1/2*1/2*1/2*1/2*1/2*1/2
=1/64
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