計算 \frac{5}{6}-\frac{3}{8}+\left(-2\frac{7}{8}\right) 之值為何？
\frac{5}{6}-\frac{3}{8}+\left(-2\frac{7}{8}\right)
-\frac{2}{3}
-2\frac{5}{12}
-\frac{31}{24}
-14\frac{11}{24}
