a)
\(1\dfrac{3}{5}-\left|\dfrac{5}{2}\right|+\dfrac{-1}{4}+\dfrac{21}{8}=\dfrac{8}{5}-\dfrac{5}{2}-\dfrac{1}{4}+\dfrac{21}{8}\\ =-\dfrac{9}{10}-\dfrac{1}{4}+\dfrac{21}{8}=-\dfrac{23}{20}+\dfrac{21}{8}=\dfrac{59}{40}\)
b)
\(\dfrac{3}{5}+\left|\dfrac{-4}{3}\right|-\dfrac{1}{2}+\dfrac{-1}{4}=\dfrac{3}{5}+\dfrac{4}{3}-\dfrac{1}{2}-\dfrac{1}{4}\\ =\dfrac{29}{15}-\dfrac{1}{2}-\dfrac{1}{4}=\dfrac{43}{30}-\dfrac{1}{4}=\dfrac{71}{60}\)
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