题目内容

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
].
(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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