题目内容

脱式计算.
3.8+3.17÷(22+9.7)
68÷[0.5×(7.5-0.7)]352-162÷36×24
[
5
6
-(
5
14
-
2
7
)]×
7
18
1
3
+
1
6
+
1
9
)÷
1
36
1
8
×[
1
2
÷(
3
5
×
10
9
)].
(1)3.8+3.17÷(22+9.7),
=3.8+3.17÷31.7,
=3.8+0.1,
=3.9;

(2)68÷[0.5×(7.5-0.7)],
=68÷[0.5×6.8],
=68÷3.4,
=20;

(3)352-162÷36×24,
=352-4.5×24,
=352-108,
=244;

(4)[
5
6
-(
5
14
-
2
7
)]×
7
18

=[
5
6
-
1
14
7
18

=
5
6
×
7
18
-
1
14
×
7
18

=
35
108
-
7
36

=
14
108

=
7
54


(5)(
1
3
+
1
6
+
1
9
)÷
1
36

=(
1
3
+
1
6
+
1
9
)×36,
=
1
3
×36+
1
6
×36+
1
9
×36,
=12+6+4,
=22;

(6)
1
8
×[
1
2
÷(
3
5
×
10
9
)],
=
1
8
×[
1
2
÷
2
3
],
=
1
8
×
3
4

=
3
32
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