问题 解答题
用合适的方法计算下面各题.
3
4
-
3
25
)×100
2
7
×
17
11
+
5
11
×
2
7
3
8
×
10
11
+
5
8
÷
11
10
(12×
5
6
-7.3)÷
9
4
8
9
÷〔(
2
5
+
1
10
)×
4
3
9
13
×27-
9
13
)×
7
18
答案

(1)(

3
4
-
3
25
)×100,

=

3
4
×100-
3
25
×100,

=75-12,

=63;

(2)

2
7
×
17
11
+
5
11
×
2
7

=

2
7
×(
17
11
+
5
11
),

=

2
7
×2,

=

4
7

(3)

3
8
×
10
11
+
5
8
÷
11
10

=

3
8
×
10
11
+
5
8
×
10
11

=(

3
8
+
5
8
)×
10
11

=1×

10
11

=

10
11

(4)(12×

5
6
-7.3)÷
9
4

=(10-7.3)÷

9
4

=2.7×

4
9

=1.2;

(5)

8
9
÷〔(
2
5
+
1
10
)×
4
3
],

=

8
9
÷〔
1
2
×
4
3
〕,

=

8
9
×
3
2

=

4
3

(6)(

9
13
×27-
9
13
)×
7
18

=[(

9
13
×(27-1)]×
7
18

=[

9
13
×26]×
7
18

=18×

7
18

=7.

单项选择题
单项选择题