问题 解答题
简算.
13
3
-
7
13
-
6
13
5
7
÷6+
5
7
×
5
6
答案

(1)

13
3
-
7
13
-
6
13

=

13
3
-(
7
13
+
6
13
),

=

13
3
-1,

=

10
3

(2)

5
7
÷6+
5
7
×
5
6

=

5
7
×
1
6
+
5
7
×
5
6

=

5
7
×(
1
6
+
5
6
),

=

5
7
×1,

=

5
7

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