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

解;(1)

5
7
×
5
9
+
4
9
÷
7
5

=(

5
9
+
4
9
)×
5
7

=1×

5
7

=

5
7

(2)1÷(1+

5
8
÷5),

=1÷(1+

1
8
),

=1÷

9
8

=

8
9

(3)(

1
2
+
1
6
)×(
1
3
-
1
4
),

=

2
3
×
1
12

=

1
18

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