问题 解答题
1
5
×8÷
4
5
1
5
+
2
7
+
4
5
+
5
7
[1-(
1
4
+
3
8
)]÷
1
4
(
5
6
-
2
3
9
10
答案

(1)

1
5
×8÷
4
5

=

8
5
÷
4
5

=2;

(2)

1
5
+
2
7
+
4
5
+
5
7

=(

1
5
+
4
5
)+(
2
7
+
5
7
),

=1+1,

=2;

(3)[1-(

1
4
+
3
8
)]÷
1
4

=[1-

5
8
1
4

=

3
8
÷
1
4

=

3
2

(4)(

5
6
-
2
3
)×
9
10

=

1
6
×
9
10

=

3
20

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