问题 解答题
计算:
(1)-16+23+(-17)-(-7);
(2)(-
1
8
)+(-
1
4
)-(-
3
8
)-(+
1
2
)-(-
3
4

(3)(-
1
2
+
3
4
-
5
8
)×(-16)
(4)-14+(1-0.5)×
1
3
×〔2-(-3)2
答案

(1)-16+23+(-17)-(-7)

=-16+23-17+7

=-33+30

=-3;

(2)(-

1
8
)+(-
1
4
)-(-
3
8
)-(+
1
2
)-(-
3
4

=-

1
8
+
3
8
-
1
4
+
3
4
-
1
2

=(-

1
8
+
3
8
)-
1
4
+
3
4
-
1
2

=

3
4
-
1
2

=

1
4

(3)(-

1
2
+
3
4
-
5
8
)×(-16)

=(-

1
2
)×(-16)+
3
4
×(-16)-
5
8
×(-16)

=8-12+10

=18-12

=6;

(4)-14+(1-0.5)×

1
3
×〔2-(-3)2

=-1+

1
2
×
1
3
×(2-9)

=-1+

7
6

=

1
6

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