(1)原式=-3-20+4
=-23+4
=-19;
(2)原式=([1/3]-[3/4]+[5/6])×(-12)
=[1/3]×(-12)-[3/4]×(-12)+[5/6]×(-12)
=-4+9-10
=-5;
(3)原式=-1-2×[1/3]
=-1[2/3];
(4)原式=-3×[1/9]+27+[1/3]
=27.
(1)原式=-3-20+4
=-23+4
=-19;
(2)原式=([1/3]-[3/4]+[5/6])×(-12)
=[1/3]×(-12)-[3/4]×(-12)+[5/6]×(-12)
=-4+9-10
=-5;
(3)原式=-1-2×[1/3]
=-1[2/3];
(4)原式=-3×[1/9]+27+[1/3]
=27.