112+214+318+…+101210=______.-数学

题目简介

112+214+318+…+101210=______.-数学

题目详情

1
1
2
+2
1
4
+3
1
8
+…+10
1
210
=______.
题型:填空题难度:中档来源:不详

答案

1class="stub"1
2
+2class="stub"1
4
+3class="stub"1
8
+…+10class="stub"1
210

=1+class="stub"1
2
+2+class="stub"1
4
+…+10+class="stub"1
210

=(1+2++…+10)+(class="stub"1
2
+class="stub"1
4
+…+class="stub"1
210

=
(1+10)×10
2
+
class="stub"1
2
(1-class="stub"1
210
)
1-class="stub"1
2

=56-class="stub"1
210
=class="stub"57343
1024

故答案:class="stub"57343
1024

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