(1)原式=-3-4+11+19=-7+30=23;(2)原式=-0.5+3.25+2.75-7.5=-8+6=-2;(3)原式=-5-9÷4=-7 1 4 ;(4)原式=-45+30+33=18;(5)原式=-1×9×(-3)=27;(6)原式=-1- 1 2 × 1 3 ×(-7)=-1+ 7 6 = 1 6 .