试题:
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:

我来补答
(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
 
 
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