（-5/6）÷（-3又1/6）÷【1/24×（-1又1/4）】-0.25÷1/4
=（-5/6）÷（-19/6）÷【1/24×（-5/4）】-0.25×4
=5/6×6/19÷（-5/96）-1
=-5/19×96/5-1
=-96/19-1
=-115/19
=-6又1/19