问题 解答题
计算下列各题.(能简算的要简算)
7
9
-
7
9
÷7=
15÷
8
9
+15×
7
8
=
3
22
÷[
5
4
÷(
14
3
-
1
2
)]
3-
5
18
×
27
40
-
13
16
=
7
9
×9+
7
9
19
13
÷
7
5
-
6
13
×
5
7
=
答案

(1)7÷

7
9
-
7
9
÷7

=7×

9
7
-
7
9
×
1
7

=9-

1
9

=8

8
9

(2)15÷

8
9
+15×
7
8

=15×

9
8
+15×
7
8

=15×(

9
8
+
7
8
),

=15×2,

=30;

(3)

3
22
÷[
5
4
÷(
14
3
-
1
2
)]

=

3
22
÷[
5
4
÷
25
6
],

=

3
22
÷[
5
4
×
6
25
],

=

3
22
÷
3
10

=

3
22
×
10
3

=

5
11

(4)3-

5
18
×
27
40
-
13
16

=3-

3
16
-
13
16

=3-(

3
16
+
13
16
),

=3-1,

=2;

(5)

7
9
×9+
7
9

=7+

7
9

=7

7
9

(6)

19
13
÷
7
5
-
6
13
×
5
7

=

19
13
×
5
7
-
6
13
×
5
7

=(

19
13
-
6
13
)×
5
7

=1×

5
7

=

5
7

填空题
单项选择题