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112-256+3112-41920+5130-64142+7156-87172+9190=______．-数学

题目简介

112-256+3112-41920+5130-64142+7156-87172+9190=______．-数学

题目详情

1
1
2
-2
5
6
+3
1
12
-4
19
20
+5
1
30
-6
41
42
+7
1
56
-8
71
72
+9
1
90
=______．
题型：填空题难度：中档来源：不详

答案

原式=class="stub"3
2
-3+class="stub"1
6
+3+class="stub"1
12
-5+class="stub"1
20
+5+class="stub"1
30
-7+class="stub"1
42
+7+class="stub"1
56
-9+class="stub"1
72
+9+class="stub"1
90

=2-class="stub"1
2
+class="stub"1
6
+class="stub"1
12
+class="stub"1
20
+class="stub"1
30
+class="stub"1
42
+class="stub"1
56
+class="stub"1
72
+class="stub"1
90

=2-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
+class="stub"1
6
-class="stub"1
7
+class="stub"1
7
-class="stub"1
8
+class="stub"1
8
-class="stub"1
9
+class="stub"1
9
-class="stub"1
10

=2-class="stub"1
10

=class="stub"19
10
．

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