问题 解答题
用简便方法计算.
23×
13
24
+
13
24

7.2×
3
4
+7.2÷4.
答案

(1)23×

13
24
+
13
24

=(23+1)×

13
24

=24×

13
24

=13;

(2)7.2×

3
4
+7.2÷4,

=7.2×

3
4
+7.2×
1
4

=7.2×(

3
4
+
1
4
),

=7.2×1,

=7.2.

单项选择题
单项选择题