问题 解答题
下面各题怎样简便怎样算.
①0.375×5.8+
5
8
×5.8
②12÷
4
7
-20×5%
(4.16×
9
11
+3
2
11
×4.16)×25
答案

(1)0.375×5.8+

5
8
×5.8,

=5.8×(0.375+

5
8
),

=5.8×(

3
8
+
5
8
),

=5.8×1,

=5.8;

(2)12÷

4
7
-20×5%,

=12×

7
4
-20×
1
20

=21-1,

=20;

(3)(4.16×

9
11
+3
2
11
×4.16)×25,

=[4.16×(

9
11
+3
2
11
)]×25,

=[4.16×4]×25,

=4.16×4×25,

=4.16×(4×25),

=4.16×100,

=416.

单项选择题
单项选择题