问题 解答题
计算下面各题,怎样算简便就怎样算.
15×
3
8
÷
9
4
30×(
2
5
+
1
6
-
4
15
2
5
×
7
13
+40%×
6
13
10-(
2
5
+
3
5
×2)
7
15
+
1
4
×
12
5
-
3
5
[(
7
5
-1)÷
2
5
5
4
答案

(1)15×

3
8
÷
9
4

=15×

3
8
×
4
9

=2

1
2

(2)30×(

2
5
+
1
6
-
4
15

=30×

2
5
+30×
1
6
-30×
4
15

=12+5-8

=9;

(3)

2
5
×
7
13
+40%×
6
13

=

2
5
×
7
13
+
2
5
×
6
13

=

2
5
×(
7
13
+
6
13

=

2
5
×1

=

2
5

(4)10-(

2
5
+
3
5
×2)

=10-(

2
5
+
6
5

=10-1

3
5

=8

2
5

(5)

7
15
+
1
4
×
12
5
-
3
5

=

7
15
+
3
5
-
3
5

=

7
15

(6)[(

7
5
-1)÷
2
5
5
4

=[

2
5
÷
2
5
5
4

=1×

5
4

=1

1
4

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