问题 解答题
计算下列各题:
(1)-24-(3+12)
(2)5
1
5
-[2
1
6
+(-4.8)-(-4
5
6
)]

(3)(-3
1
3
)÷2
1
3
×
7
10

(4)
4
5
×(-
25
3
)×(-
7
10
)-(-2)×(-2)
答案

(1)原式=-24-15=-39;

(2)原式=5

1
5
-2
1
6
-(-4.8)+(-4
5
6

=5

1
5
-2
1
6
+4
4
5
-4
5
6

=(5

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

=10-7

=3;

(3)原式=-

10
3
×
3
7
×
7
10
=-1;

(4)原式=

4
5
×(-
25
3
)×(-
7
10
)-(-2)×(-2)

=

4
5
×
25
3
×
7
10
-2×2

=

14
3
-4

=

14
3
-
12
3

=

2
3

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