问题 解答题
0.1
2
+0.2
3
+0.3
4
+0.5
6
+0.6
7
+0.7
8
+0.8
9
=______.
答案

0.1

2
+0.2
3
+0.3
4
+0.5
6
+0.6
7
+0.7
8
+0.8
9

=

11
90
+
21
90
+
31
90
+
51
90
+
61
90
+
71
90
+
81
90

=

11+21+31+51+61+71+81
90

=

327
90

=3

19
30

故答案为:3

19
30

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