13+115+135+163+199+1143=______.-数学

题目简介

13+115+135+163+199+1143=______.-数学

题目详情

1
3
+
1
15
+
1
35
+
1
63
+
1
99
+
1
143
=______.
题型:解答题难度:中档来源:不详

答案

class="stub"1
3
+class="stub"1
15
+class="stub"1
35
+class="stub"1
63
+class="stub"1
99
+class="stub"1
143

=[(1-class="stub"1
3
)+(class="stub"1
3
-class="stub"1
5
)+(class="stub"1
5
-class="stub"1
7
)+(class="stub"1
7
-class="stub"1
9
)+(class="stub"1
9
-class="stub"1
11
)+(class="stub"1
11
-class="stub"1
13
)]×class="stub"1
2

=[1-class="stub"1
13
class="stub"1
2

=class="stub"12
13
×class="stub"1
2

=class="stub"6
13

故答案为:class="stub"6
13

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