238 $-\left[3-\left(\frac{5}{6}-1\right)\right]-\left[\frac{1}{2}+\left(\frac{1}{3}-2\right)+1\right]$
239 $\frac{7}{6}+\left(-1+\frac{2}{5}\right)-\left[-\frac{6}{5}+\left(-\frac{1}{3}+2\right)-\frac{2}{4}\right]$
240 $\frac{5}{3}+\left[-\frac{3}{2}+\left(\frac{13}{5}-4\right)\right]-\left(1+\frac{1}{2}-\frac{11}{6}\right)$