问题 解答题
脱式运算
(1)
5
12
×
4
15
+
2
3

(2)
5
8
×(
4
5
÷
2
5
)

(3)36×(
2
9
+
5
12
)

(4)
3
4
×
1
13
+
1
4
÷13
答案

(1)

5
12
×
4
15
+
2
3

=

1
9
+
2
3

=

7
9

(2)

5
8
×(
4
5
÷
2
5
),

=

5
8
×(
4
5
×
5
2
),

=

5
8
×2,

=

5
4

(3)36×(

2
9
+
5
12
),

=36×

2
9
+36×
5
12

=8+15,

=23;

(4)

3
4
×
1
13
+
1
4
÷13,

=

3
4
×
1
13
+
1
4
×
1
13

=(

3
4
+
1
4
)×
1
13

=1×

1
13

=

1
13

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单项选择题 A3/A4型题