问题 解答题
怎样算简便就怎样算.
[
7
9
-(
7
9
-
9
16
)]×
8
27
11
12
-
3
4
)÷(2-
1
2
)4.86×99+4.86.
答案

(1)[

7
9
-(
7
9
-
9
16
)]×
8
27

=[

7
9
-
7
9
+
9
16
8
27

=

9
16
×
8
27

=

1
6

(2)(

11
12
-
3
4
)÷(2-
1
2

=

1
6
÷
3
2

=

1
9

(3)4.86×99+4.86

=4.86×(99+1)

=4.86×100

=486.

选择题
单项选择题