1-12-14-18-…-1512.-数学

题目简介

1-12-14-18-…-1512.-数学

题目详情

1-
1
2
-
1
4
-
1
8
-…-
1
512
题型:解答题难度:中档来源:不详

答案

1-class="stub"1
2
-class="stub"1
4
-class="stub"1
8
-…-class="stub"1
512

=(1-class="stub"1
2
)-(class="stub"1
2
-class="stub"1
4
)-(class="stub"1
4
-class="stub"1
8
)-…-(class="stub"1
256
-class="stub"1
512

=class="stub"1
2
-class="stub"1
2
+class="stub"1
4
-class="stub"1
4
+class="stub"1
8
-…-class="stub"1
256
+class="stub"1
512

=class="stub"1
512

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