问题 解答题
计算:
(1)-|-18
3
4
|+(+43
1
2
)-|-(-13
1
3
)|+|-70
1
2
|

(2)(-2×5)3-(-1
7
9
)×(-
3
4
)2-(-
1
0.1
)2

(3)
2
3
+(
5
6
+2.8+
1
3
)-(2
4
5
-
5
6
)

(4)-14-(1-0.5)×(
2
3
)2÷[-2-(-3)2]
答案

(1)原式=-18

3
4
+43
1
2
-13
1
3
+70
1
2

=(43

1
2
+70
1
2
)-(18
3
4
+13
1
3

=114-(18+13)-(

3
4
+
1
3

=114-31-

13
12

=83-

13
12

=81

11
12

(2)原式=(-10)3-(-

16
9
)×
9
16
-(-10)2

=(-10)2(-10-1)+1

=-1100+1

=-1009;

(3)原式=

2
3
+
5
6
+2.8+
1
3
-
14
5
+
5
6

=(

2
3
+
1
3
)+(
5
6
+
5
6
)+2.8-
14
5

=1+

5
3
+
14
5
-
14
5

=

8
3

(4)原式=-1-

1
2
×
4
9
÷[-2-9]

=-1-

2
9
×(-
1
11

=-1+

2
99

=-

97
99

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