\(a,\dfrac{-3}{16}+\dfrac{-3}{8}-\dfrac{5}{4}\)
\(=\dfrac{-3}{16}+\dfrac{-6}{16}-\dfrac{20}{16}\)
\(=\dfrac{-29}{16}\)
\(b,\left(-\dfrac{25}{13}\right)+\left(-\dfrac{9}{17}\right)+\dfrac{12}{13}+\left(-\dfrac{25}{17}\right)\)
\(=-\dfrac{25}{13}-\dfrac{9}{17}+\dfrac{12}{13}-\dfrac{25}{17}\)
\(=\left(-\dfrac{25}{13}+\dfrac{12}{13}\right)+\left(-\dfrac{9}{17}-\dfrac{25}{17}\right)\)
\(=-1+2\)
\(=1\)
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