问题 解答题
15-
7
18
+
1
5
-
11
18
4.2÷1.5-1.5×0.6[2-(
2
3
-
1
2
)]÷
11
12
5
6
-
3
4
)÷(
3
14
+
2
7
17
24
×
3
4
+
17
24
÷4
8
9
×
[
15
16
+
7
16
-
1
4
÷
1
2
].
答案

(1)15-

7
18
+
1
5
-
11
18

=15-(

11
18
+
7
18
)+
1
5

=15-1+

1
5

=14

1
5

(2)4.2÷1.5-1.5×0.6,

=2.8-0.9,

=1.9;

(3)[2-(

2
3
-
1
2
)]÷
11
12

=[2-

1
6
12
11

=

11
6
×
12
11

=2;

(4)(

5
6
-
3
4
)÷(
3
14
+
2
7
),

=

1
12
÷
1
2

=

1
12
×2,

=

1
6

(5)

17
24
×
3
4
+
17
24
÷4,

=

17
24
×
3
4
+
17
24
×
1
4

=

17
24
×(
3
4
+
1
4
),

=

17
24
×1,

=

17
24

(6)

8
9
×[
15
16
+
7
16
-
1
4
÷
1
2
],

=

8
9
×[
15
16
+
3
16
×2],

=

8
9
×[
15
16
+
6
16
],

=

8
9
×
21
16

=

7
6

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