(1)原式=0+6+2+13-8=8-8+13=13;(2)原式=-5.3-3.2+2.5-5.7=-8.5-5.7+2.5=-6-5.7=-11.7;(3)原式=- 3 12 + 10 12 + 8 12 - 6 12 ?3+10+8?6 12 = 9 12 = 3 4 ;(4)原式=-1 1 2 -2 1 2 +1 1 4 -1 1 4 +3 1 4 =-4+0+3 1 4 =- 3 4 .