32+76+1312+2120+3130+4342+5756+7372.-数学

题目简介

32+76+1312+2120+3130+4342+5756+7372.-数学

题目详情

3
2
+
7
6
+
13
12
+
21
20
+
31
30
+
43
42
+
57
56
+
73
72
题型:解答题难度:中档来源:不详

答案

class="stub"3
2
+class="stub"7
6
+class="stub"13
12
+class="stub"21
20
+class="stub"31
30
+class="stub"43
42
+class="stub"57
56
+class="stub"73
72

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

=(1+1+1+…+1)+(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
),
=8+(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
+class="stub"1
6
-class="stub"1
7
+class="stub"1
7
-class="stub"1
8
+class="stub"1
8
-class="stub"1
9
),
=8+(1-class="stub"1
9
),
=8+class="stub"8
9

=8class="stub"8
9

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