巧算:16+112+120+130+142+156.-数学

题目简介

巧算:16+112+120+130+142+156.-数学

题目详情

巧算:
1
6
+
1
12
+
1
20
+
1
30
+
1
42
+
1
56
题型:解答题难度:中档来源:不详

答案

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
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
2
-class="stub"1
8

=class="stub"3
8

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