a: \(=\dfrac{3^3\cdot0.7^3\cdot0.7^2}{2.1^3\cdot2.1}=\dfrac{0.7^2}{2.1}=\dfrac{0.49}{2.1}=\dfrac{7}{30}\)
b: \(=\dfrac{3^3\cdot0.5^3\cdot0.5^2}{1.5^3\cdot1.5}=\dfrac{0.25}{1.5}=\dfrac{1}{6}\)
c: \(=\dfrac{2^{15}\cdot2^{12}}{2^{26}}-\dfrac{3^{33}\cdot2^{30}}{2^{32}\cdot3^{32}}=2-\dfrac{3}{4}=\dfrac{5}{4}\)
d: \(=\left(\dfrac{1}{7}\cdot7\right)^{2001}\cdot7^2=49\)