(1)(-12)-5+(-14)-(-39)(2)-34+23(3)312+(-12)-(-13)+223(4)2.7-(-3.5)(5)36-76+

(1)(-12)-5+(-14)-(-39)(2)-34+23(3)312+(-12)-(-13)+223(4)2.7-(-3.5)(5)36-76+(-23)-105(6)|-312+(-158)|-|-234+78|

(1)原式=-12-5-14+39=-31+39=8;
(2)原式=-
1
12

(3)原式=3
1
2
-
1
2
+
1
3
+2
2
3
=3+3=6;
(4)原式=2.7+3.5=6.2;
(5)原式=36-76-23-105=-168;
(6)原式=3
1
2
+1
5
8
-2
3
4
-
7
8
=
3
4
+
3
4
=
3
2
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