计算
1.(-3)+(-4)-(+11)-(-19)
2.
3.
4.
1.1
2.7
3.-19.5
解析:(1)(-3)+(-4)-(+11)-(-19)
=1
(2)原式=4.6+
=4.6-1.6+4
=7
(3)原式=-
=
=-19.5
(4)原式=-1-