题目内容

递等式计算:
6
11
+
5
11
×
3
5

5
9
×
2
5
+
5
9
×
3
5

15
42
÷
5
7
÷
2
3

1
4
+
2
3
)×60%.
(1)
6
11
+
5
11
×
3
5

=
6
11
+
3
11

=
9
11


(2)
5
9
×
2
5
+
5
9
×
3
5

=
5
9
×(
2
5
+
3
5
),
=
5
9
×1,
=
5
9


(3)
15
42
÷
5
7
÷
2
3

=
1
2
÷
2
3

=
3
4


(4)(
1
4
+
2
3
)×60%,
=
11
12
×60%,
=
11
20
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