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.-数学

题目简介

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.-数学

题目详情

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
题型:填空题难度:中档来源:不详

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

=class="stub"11
90
+class="stub"21
90
+class="stub"31
90
+class="stub"41
90
+class="stub"51
90
+class="stub"61
90
+class="stub"71
90
+class="stub"81
90

=class="stub"11+21+31+41+51+61+71+81
90

=
(11+81)×8÷2
90

=class="stub"368
90

=class="stub"184
45

=4class="stub"4
45

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