问题 解答题
用自己喜欢的方法计算.
3.6×(1-20%)

3-
7
12
-
5
12
5
7
×
3
8
+
5
8
×
5
7
1
4
+
5
6
-
1
3
)×12.
答案

①3.6×(1-20%),

=3.6×0.8,

=2.88;

②3-

7
12
-
5
12

=3-(

7
12
+
5
12
),

=3-1,

=2;

5
7
×
3
8
+
5
8
×
5
7

=

5
7
×(
3
8
+
5
8
),

=

5
7
×1,

=

5
7

④(

1
4
+
5
6
-
1
3
)×12,

=

1
4
×12+
5
6
×12-
1
3
×12,

=3+10-4,

=9.

问答题
单项选择题 B型题