a) Ta có: \(1.6^2:0.4^2-2\dfrac{1}{4}+\dfrac{7}{5}-1\dfrac{3}{4}\)
\(=0.4^2-\left(\dfrac{9}{4}+\dfrac{7}{4}\right)+\dfrac{7}{5}\)
\(=\dfrac{4}{25}-4+\dfrac{7}{5}\)
\(=\dfrac{4}{25}-\dfrac{100}{25}+\dfrac{35}{25}\)
\(=\dfrac{-61}{25}\)
b) Ta có: \(6\dfrac{3}{5}:\left(-\dfrac{5}{8}\right)-16\dfrac{3}{5}:\left(-\dfrac{5}{8}\right)\)
\(=\dfrac{33}{5}\cdot\dfrac{-8}{5}-\dfrac{83}{5}\cdot\dfrac{-8}{5}\)
\(=\dfrac{-8}{5}\cdot\left(-10\right)\)
=16
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