问题 解答题
计算题(每小题3分,满分24分,要求写出计算过程.)
①(+8)-(-5)+(-9)-(+13);
(-1
3
5
)+(-3.2)+|-1.8|

0-(-
1
3
)+(-
3
4
)-(-
2
3
)-(+
5
6
)

(-
3
4
+
2
3
-
1
12
)×(-24)

2
3
8
-[5
2
9
-(-7
3
8
)]-1
7
9

5
13
×(-9)+
5
13
×(-11)+
5
13
×(+10)

-0.85×
8
17
+14×
2
7
-(14×
3
7
-0.85×
8
17
)

|
4
7
-
2
5
|-|
2
5
-
7
9
|+|
2
9
-
4
7
|
答案

①原式=8+5-9-13

=-9;

②原式=-

8
5
-3.2+1.8

=-1.6-3.2+1.8

=-3;

③原式=

1
3
-
3
4
+
2
3
-
5
6

=(

1
3
+
2
3
)-(
3
4
+
5
6

=1-

19
12

=-

7
12

④原式=(-

3
4
)×(-24)+
2
3
×(-24)-
1
12
×(-24)

=18-16+2

=4;

⑤原式=

19
8
-
47
9
+
59
8
-
16
9

=(

19
8
+
59
8
)-(
47
9
+
16
9

=

78
8
-7

=

11
4

⑥原式=

5
13
×[-9-11+10]

=

5
13
×(-10)

-

50
13

⑦原式=-0.85×

8
17
+4-6+0.85×
8
17

=-2;

⑧原式=

4
7
-
2
5
-(
7
9
-
2
5
)+(
4
7
-
2
9

=

4
7
-
2
5
-
7
9
+
2
5
+
4
7
-
2
9

=(

4
7
+
4
7
)-(
7
9
+
2
9

=

8
7
-1

=

1
7

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