试题:
计算.
7
13
×
3
4
+
3
4
×
6
13
3
7
÷
7
11
+
4
7
÷
7
11
36×(
7
9
+
5
6
)÷
29
5

答案:

我来补答
(1)
7
13
×
3
4
+
3
4
×
6
13

=(
7
13
+
6
13
)×
3
4

=1×
3
4

=
3
4


(2)
3
7
÷
7
11
+
4
7
÷
7
11

=
3
7
×
11
7
+
4
7
×
11
7

=(
3
7
+
4
7
)×
11
7

=1×
11
7

=1
4
7


(3)36×(
7
9
+
5
6
)÷
29
5

=(36×
7
9
+36×
5
6
)÷
29
5

=(28+30)÷
29
5

=58÷
29
5

=10.
 
 
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