原式=-1+5×5/6÷(-5/4)-4^2012×(-1/4)^2013
=-1+5×5/6×(-4/5)-4^2012×(-1/4^2013)
=-1-10/3+1/4
=-1-3-1/3+1/4
=-4-(4/12-3/12)
=-4又1/12