问题 解答题
计算下面各题,注意使用简便运算.
(1)
4
9
×
1
5
÷
4
5
(2)
4
5
÷
2
3
÷
5
6
(3)(15-14×
4
7
)×
8
21
(4)
2
7
×
8
9
+
5
7
×
8
9
(5)
4
5
÷[(
1
3
+
2
5
)×
4
11
]
(6)
7
5
-
5
8
-
9
16
÷
3
2
答案

(1)

4
9
×
1
5
÷
4
5

=

4
9
×
1
5
×
5
4

=

1
9

(2)

4
5
÷
2
3
÷
5
6

=

4
5
×
3
2
×
6
5

=

36
25

(3)(15-14×

4
7
)×
8
21

=(15-8)×

8
21

=7×

8
21

=

8
3

(4)

2
7
×
8
9
+
5
7
×
8
9

=(

2
7
+
5
7
)×
8
9

=1×

8
9

=

8
9

(5)

4
5
÷[(
1
3
+
2
5
)×
4
11
],

=

4
5
÷[
11
15
×
4
11
],

=

4
5
÷
4
15

=

4
5
×
15
4

=3;

(6)

7
5
-
5
8
-
9
16
÷
3
2

=

7
5
-
5
8
-
9
16
×
2
3

=

7
5
-
5
8
-
3
8

=

7
5
-(
5
8
+
3
8
),

=

7
5
-1,

=

2
5

单项选择题
单项选择题 A1/A2型题