(0.75+1/6)÷11/10÷0.4*5/8=(3/4+1/6)*10/11÷2/5*5/8=11/12*10/11*5/2*5/8=125/960.125*31/48*8.25+12.5%=1/8*31/48*33/4+1/8=405/512