问题 解答题
计算下面各题.
4
5
×45+
1
5
÷
1
45
5
12
-
1
3
×
5
6
3
8
+
2
7
)÷
1
56
答案

(1)

4
5
×45+
1
5
÷
1
45

=

4
5
×45+
1
5
×45,

=(

4
5
+
1
5
)×45,

=1×45,

=45;

(2)

5
12
-
1
3
×
5
6

=

5
12
-
5
18

=

5
36

(3)(

3
8
+
2
7
)÷
1
56

=(

3
8
+
2
7
)×56,

=

3
8
×56+
2
7
×56,

=21+16,

=37.

单项选择题
单项选择题