51×87×232=
\( \frac{1}{5}\times\frac{7}{8}\times2\frac{2}{3}= \)
\( \frac{3}{4}\times\frac{2}{3}\times2\frac{1}{4}x= \)
\( \frac{7}{8}\times2\frac{7}{8}\times\frac{1}{4}= \)
\( \frac{2}{3}\times7\frac{2}{3}\times3\frac{1}{2}= \)
\( 3\frac{5}{6}\times5\frac{5}{6}\times\frac{1}{3}x= \)