\(1-\dfrac{1}{2}+2-\dfrac{2}{3}+3-\dfrac{3}{4}+4-\dfrac{1}{4}-3-\dfrac{1}{3}-2-\dfrac{1}{2}-1\)
\(=\left(1+2+3+4-3-2-1\right)+\left(\dfrac{-1}{2}+\dfrac{-2}{3}+\dfrac{-3}{4}+\dfrac{-1}{4}+\dfrac{-1}{3}+\dfrac{-1}{2}\right)\)
\(=4+\left(-1-1-1\right)=1\)