问题 解答题
72
8
21
×2.375+95
5
21
×1.6.
答案

72

8
21
×2.375+95
5
21
×1.6,

=72

8
21
×2
3
8
+95
5
21
×1
3
5

=72

8
21
×
19
8
+95
5
21
×
8
5

=72×

19
8
+
8
21
×
19
8
+95×
8
5
+
5
21
×
8
5

=171+

19
21
+152+
8
21

=(171+152)+(

19
21
+
8
21
),

=323+

27
21

=324

2
7

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