71又16分之15乘（-8）-71又16分乘以－四
=(71+15/16)*(-8)-(71+15/16)*(-4)
=-(71+15/16)*8+(71+15/16)*4
=(71+15/16)*4-(71+15/16)*8
=(71+15/16)*(4-8)
=-4*(71+15/16)
=-4*71-4*15/16
=-284-15/4
=-284-3-3/4
=-287-3/4
=-287又3/4