问题 解答题
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%.
答案

(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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