问题 解答题
计算下列各题(能简算的要简算)
2
3
+
4
15
)×30
3
8
×7+3÷
8
3
2
3
+(
4
7
+
1
2
)×
7
25
1
2
-
1
7
×
9
10
+
5
6
[1-(
1
4
+
3
8
)]÷
1
4
答案

(1)(

2
3
+
4
15
)×30,

=

2
3
×30+
4
15
×30,

=20+8,

=28;

(2)

3
8
×7+3÷
8
3

=

3
8
×7+3×
3
8

=

3
8
×(7+3),

=

3
8
×10,

=

15
4

(3)

2
3
+(
4
7
+
1
2
)×
7
25

=

2
3
+
15
14
×
7
25

=

2
3
+
3
10

=

29
30

(4)

1
2
-
1
7
×
9
10
+
5
6

=

1
2
-
9
70
+
5
6

=

1
2
+
5
6
-
9
70

=

4
3
-
9
70

=

253
210

(5)[1-(

1
4
+
3
8
)]÷
1
4

=[1-

5
8
1
4

=

3
8
÷
1
4

=

3
2

阅读理解与欣赏
单项选择题 A3/A4型题