问题 填空题
求:0.1
2
+0.2
3
+0.3
4
+0.4
5
+0.5
6
+0.6
7
+0.7
8
+0.8
9
答案

0.1

2
+0.2
3
+0.3
4
+0.4
5
+0.5
6
+0.6
7
+0.7
8
+0.8
9

=

11
90
+
21
90
+
31
90
+
41
90
+
51
90
+
61
90
+
71
90
+
81
90

=

11+21+31+41+51+61+71+81
90

=

(11+81)×8÷2
90

=

368
90

=

184
45

=4

4
45

配伍题 B型题
单项选择题