(1)[3/7]-[[19/5]-([14/5]+[4/7])],
=[3/7−[
19
5]-[14/5−
4
7]],
=[3/7−[1-
4
7]],
=[3/7+
4
7]-1,
=1-1,
=0;
(2)5.7×3.6+5.7×5.4+5.7,
=(3.6+5.4+1)×5.7,
=10×5.7,
=57;
(3)[13/18]÷([5/6]+[2/3]×[3/8]),
=[13/18÷(
5
6+
1
4]),
=[13/18÷
13
12],
=[2/3];
(4)(3.8-1.8÷2)×1.6,
=(3.8-0.9)×1.6,
=2.9×1.6,
=4.64.