问题 解答题
简便运算.
5
8
+6.4÷
8
5
-
5
8

[
5
6
-(
3
4
-
1
2
)]×
9
8
答案

(1)6×

5
8
+6.4÷
8
5
-
5
8

=6×

5
8
+6.4×
5
8
-
5
8

=(6+6.4-1)×

5
8

=11.4×

5
8

=

57
5
×
5
8

=7

1
8

(2)[

5
6
-(
3
4
-
1
2
)]×
9
8

=[

5
6
-
1
4
9
8

=

7
12
×
9
8

=

21
32

单项选择题
单项选择题