问题 解答题
计算下面各题.
3
8
×
1
9
×8

(
15
9
×
4
17
17
12

(
5
6
+
4
7
)×42
答案

(1)

3
8
×
1
9
×8,

=

3
8
×8×
1
9

=3×

1
9

=

1
3

(2)(

15
9
×
4
17
)×
17
12

=

15
9
×(
4
17
×
17
12
),

=

5
3
×
1
3

=

5
9

(3)(

5
6
+
4
7
)×42,

=

5
6
×42+
4
7
×42,

=35+24,

=59.

单项选择题
单项选择题