计算:12+16+112+130+142+156=______.-数学

题目简介

计算:12+16+112+130+142+156=______.-数学

题目详情

计算:
1
2
+
1
6
+
1
12
+
1
30
+
1
42
+
1
56
=______.
题型:填空题难度:中档来源:不详

答案

class="stub"1
2
+class="stub"1
6
+class="stub"1
12
+class="stub"1
30
+class="stub"1
42
+class="stub"1
56

=(1-class="stub"1
2
)+(class="stub"1
2
-class="stub"1
3
)+(class="stub"1
3
-class="stub"1
4
)+(class="stub"1
5
-class="stub"1
6
)+(class="stub"1
6
-class="stub"1
7
)+(class="stub"1
7
-class="stub"1
8
),
=1-class="stub"1
4
+class="stub"1
5
-class="stub"1
8

=class="stub"33
40

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