\(\dfrac{1}{4}+\dfrac{3}{5}-\dfrac{1}{8}+\dfrac{2}{5}-1-\dfrac{1}{4}\)
\(=\dfrac{1}{1}-1-\dfrac{1}{8}\)
\(=-\dfrac{1}{8}\)
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\(\dfrac{1}{4}+\dfrac{3}{5}-\dfrac{1}{8}+\dfrac{2}{5}-1-\dfrac{1}{4}\)
\(=\dfrac{1}{1}-1-\dfrac{1}{8}\)
\(=-\dfrac{1}{8}\)