6-32-76-1312-2120-3130=______.-数学

题目简介

6-32-76-1312-2120-3130=______.-数学

题目详情

6-
3
2
-
7
6
-
13
12
-
21
20
-
31
30
=______.
题型:填空题难度:中档来源:不详

答案

原式=6-1class="stub"1
2
-1class="stub"1
6
-1class="stub"1
12
1class="stub"1
20
1class="stub"1
30

=6-5-(class="stub"1
1×2
+class="stub"1
2×3
+class="stub"1
3×4
+class="stub"1
4×5
+class="stub"1
5×6
),
=1-[(class="stub"1
1
-class="stub"1
2
)+(class="stub"1
2
-class="stub"1
3
)+(class="stub"1
3
-class="stub"1
4
)+(class="stub"1
4
-class="stub"1
5
)+(class="stub"1
5
-class="stub"1
6
)],
=1-[1-class="stub"1
6
],
=class="stub"1
6

故答案为:class="stub"1
6

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