问题 解答题
下面各题怎样算简便就怎样算.
①(
1
2
-
2
7
)×14
4
13
×
1
7
+
4
13
×
6
7
③15×(9.6-8.6)÷1.2
④15-
9
20
-
3
5
⑤(10×
2
5
+6)×
13
14
2
3
×[1-(
1
3
-
1
4
)]×
5
11
答案

①(

1
2
-
2
7
)×14

=

1
2
×14-
2
7
×
14,

=7-4,

=3;

4
13
×
1
7
+
4
13
×
6
7

=(

1
7
+
6
7
)×
4
13

=1×

4
13

=

4
13

③15×(9.6-8.6)÷1.2

=15×1÷1.2,

=15÷1.2,

=12.5;

④15-

9
20
-
3
5

=15-

9
20
-
12
20

=14

11
20
-
12
20

=13

19
20

⑤(10×

2
5
+6)×
13
14

=(4+6)×

13
14

=10×

13
14

=

65
7

2
3
×[1-(
1
3
-
1
4
)]×
5
11

=

2
3
×[1-(
4
12
-
3
12
)]×
5
11

=

2
3
×[1-
1
12
5
11

=

2
3
×
11
12
×
5
11

=

5
18

选择题
单项选择题 案例分析题