问题 解答题
计算:
(1)(
5
12
-
7
9
-
2
3
)÷(-
1
36
)          
(2)
5
6
÷[-
8
21
×(-1
3
4
)-0.25]
×(-2
2
5
)

(3)-14-{(-3)2-[3+0.4×(-1
1
2
)]÷(-2)3}.
答案

(1)(

5
12
-
7
9
-
2
3
)÷(-
1
36

=(

5
12
-
7
9
-
2
3
)×(-36)

=

5
12
×(-36)-
7
9
×(-36)-
2
3
×(-36)

=-15+28+24

=-15+52

=37;

(2)

5
6
÷[-
8
21
×(-1
3
4
)-0.25]×(-2
2
5
)

=

5
6
÷[-
8
21
×(-
7
4
)-
1
4
]×(-
12
5

=

5
6
÷(
2
3
-
1
4
)×(-
12
5

=

5
6
×
12
5
×(-
12
5

=-

24
5

(3)-14-{(-3)2-[3+0.4×(-1

1
2
)]÷(-2)3}

=-1-{9-[3+

2
5
×(-
3
2
)]÷(-8)}

=-1-[9-(3-

3
5
)×(-
1
8
)]

=-1-[9-

12
5
×(-
1
8
)]

=-1-(9+

3
10

=(-1)+(-9

3
10

=-10

3
10

单项选择题
单项选择题