题目内容

计算:
(1)23-17-(-7)+(-16)
(2)(-0.5)+(+3
1
4
)+(+2.75)+(-5
1
2

(3)240
24
39
÷(-48)
(4)(
7
3
-3.75+
7
6
)×(-12)-0.252÷(-
1
2
4
(1)原式=23-17+7-16=30-33
=-3;

 (2)原式=-
1
2
+3
1
4
+2
3
4
-5
1
2

=-
1
2
-5
1
2
+3
1
4
+2
3
4

=-6+6
=0;

(3)原式=(240+
24
39
)÷(-48)
=240÷(-48)+
24
39
÷(-48)
=-5-
1
78

=-5
1
78


(4)原式=(
7
3
-
15
4
+
7
6
)×(-12)-(
1
4
2÷
1
16

=
7
3
×(-12)-
15
4
×(-12)+
7
6
×(-12)-
1
16
×16
=-28+45-14-1
=-43+45
=2.
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