(1)原式=-64× 1 4 × 1 5 =- 16 5 ;(2)原式=0.75×(-1.53+0.53-3.4)=3.3;(3)原式=- 1 2 ×3×18=-27;(4)原式=75+32×(- 1 4 )×(- 5 4 )=75+10=85.