(1)原式=(-11)+(+33)=22;(2)原式=-1-0.5× 1 3 ×(2?9),=-1- 1 2 × 1 3 ×(?7),=-1+ 7 6 ,= 1 6 ;(3)原式= 2 3 ×48? 1 4 ×48? 3 8 ×48+ 5 24 ×48,=32-12-18+10,=12.