(3又3/11×25.8-3又3/11×16.76+18/55×19.6)×(1.25-7/12+5/36)

=(36/11*25.8-36/11*16.76+18/55*2*5*1.96)*(45/36-21/36+5/36)
=36/11*(25.8-16.76+1.96)*29/36
=36/11*11*29/36
=29