数学题!1.｛（10.75-4又12分之11×2又11分之7｝÷｛（1.0125+12分之1）÷（2.25÷10又11

[(10.75－4 11/12)×2 7/11]÷[(1.25+1/12)÷(2.25÷10 10/11)]
=[(43/4-59/12)*(29/11)]/{[(5/4+1/12)/[(9/4)/(120/11)]}
=[(35/6)*(29/11)]/[(4/3)/(33/160)]
=[(35/6)*(29/11)]/(640/99)
=(35*29*99)/(6*11*640)
=609/256