问题 解答题
用简便方法计算下面各题.
5
6
+
7
8
)×24=
15
4
25
+
3.25+4
21
25
+2
3
4
=
答案

(1)(

5
6
+
7
8
)×24

=

5
6
×24+
7
8
×24

=20+21

=41;

(2)15

4
25
+3.25+4
21
25
+2
3
4

=15

4
25
+3
1
4
+4
21
25
+2
3
4

=(15

4
25
+4
21
25
)+(3
1
4
+2
3
4

=20+6

=26.

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