问题 解答题
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
)].
答案

(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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