问题 解答题
下面各题,怎样算简便就怎样算.
(1)9+
9
20
÷9      
(2)
7
12
×
3
7
×
5
6
(3)
43
97
×98
(4)
4
9
×
5
2
+
5
9
÷
2
5
(5)0.8+
4
9
+
1
5
+
5
9
   
(6)
1
2
÷[
1
3
×(
3
5
-
3
10
)]
答案

(1)9+

9
20
÷9,

=9+

9
20
×
1
9

=9+

1
20

=9

1
20

(2)

7
12
×
3
7
×
5
6
=
5
24

(3)

43
97
×98,

=

43
97
×(97+1),

=

43
97
×97+
43
97

=43+

43
97

=43

43
97

(4)

4
9
×
5
2
+
5
9
÷
2
5

=

4
9
×
5
2
+
5
9
×
5
2

=(

4
9
+
5
9
)×
5
2

=1×

5
2

=

5
2

(5)0.8+

4
9
+
1
5
+
5
9

=0.8+0.2+(

4
9
+
5
9
),

=1+1,

=2;

(6)

1
2
÷[
1
3
×(
3
5
-
3
10
)],

=

1
2
÷[
1
3
×
3
10
],

=

1
2
÷
1
10

=

1
2
×10,

=5.

问答题
填空题