①、1又1/4x7又7/13×8+8x1又1/13x1.25-125%x1又3/13×8+4又12/13÷4/5
=1.25*(7+7/13+8+8/13-8-24/13+4+12/13)
=1.25*12
=15
②、（1/6+1/10-4/15）x1.01x99
=(1/6+1/10-4/15)*1.01*(100-1)
=0
③、（96又63/73+36又24/25）÷（32又21/73+12又8/25）注：这道题要用分数线形式来做,分数线当除号
=(96+63/73+36+24/25)/(32+21/73+12+8/25)=3;
④、5/9x79又6/17+50x1/9+11/9x5/17
=(5/9)(79+6/17+10+11/17)
=(5/9)*90
=50