问题 解答题
计算下面各题,注意使用简便算法.
9
10
÷
7
4
+
3
7
×
9
10
(
14
15
-
5
9
-
1
5
)×45
6
7
+
7
9
×
3
2
+
5
6
3
5
-
3
5
÷3
1
5
÷
3
5
÷5
[
5
6
-(
2
5
+
1
3
)]×
5
7
5
11
×
1
2
÷
5
11
×
1
2
3
4
÷8
+
3
4
÷
8
7
8
15
×
7
9
-
7
15
×
7
9
答案

(1)

9
10
÷
7
4
+
3
7
×
9
10

=

9
10
×
4
7
+
3
7
×
9
10

=

9
10
×(
4
7
+
3
7

=

9
10

(2)(

14
15
-
5
9
-
1
5
)×45

=

14
15
×45-
5
9
×45-
1
5
×45

=42-25-9

=17-9

=8;

(3)

6
7
+
7
9
×
3
2
+
5
6

=

6
7
+
7
6
+
5
6

=

6
7
+(
7
6
+
5
6

=

6
7
+2

=2

6
7

(4)3÷

3
5
-
3
5
÷3

=5-

1
5

=4

4
5

(5)6÷

1
5
÷
3
5
÷5

=30÷

3
5
÷5

=50÷5

=10;

(6)[

5
6
-(
2
5
+
1
3
)]×
5
7

=[

5
6
-
11
15
5
7

=

1
10
×
5
7

=

1
14

(7)

5
11
×
1
2
÷
5
11
×
1
2

=(

5
11
÷
5
11
)×(
1
2
×
1
2

=1×

1
4

=

1
4

(8)

3
4
÷8+
3
4
÷
8
7

=

3
4
×
1
8
+
3
4
×
7
8

=

3
4
×(
1
8
+
7
8

=

3
4

(9)

8
15
×
7
9
-
7
15
×
7
9

=(

8
15
-
7
15
)×
7
9

=

1
15
×
7
9

=

7
135

选择题
单项选择题