3/17*3/4+36/17*0.75-0.75+（12/17）/（4/3）
=3/17*3/4+36/17*3/4-3/4+（12/17)*(3/4)
=(3/4)[(3+36-17+12)/17]
=(3/4)*(34/17)
=(3/4)*2
=3/2