(2343+4343+6343+…+98343)-(3686+5686+7686+…+99686)-数学

题目简介

(2343+4343+6343+…+98343)-(3686+5686+7686+…+99686)-数学

题目详情

2
343
+
4
343
+
6
343
+…+
98
343
)-(
3
686
+
5
686
+
7
686
+…+
99
686
题型:解答题难度:中档来源:不详

答案

class="stub"2
343
+class="stub"4
343
+class="stub"6
343
+…+class="stub"98
343
)-(class="stub"3
686
+class="stub"5
686
+class="stub"7
686
+…+class="stub"99
686
),
=(class="stub"4
686
+class="stub"8
686
+class="stub"12
686
+…+class="stub"196
686
)-(class="stub"3
686
+class="stub"5
686
+class="stub"7
686
+…+class="stub"99
686
),
=(class="stub"4
686
-class="stub"3
686
)+(class="stub"8
686
-class="stub"5
686
)+(class="stub"12
686
-class="stub"7
686
)+…+(class="stub"196
686
-class="stub"99
686
),
=class="stub"1
686
+class="stub"3
686
+class="stub"5
686
+…+class="stub"97
686

=
(1+97)×49
686×2

=class="stub"7
2

更多内容推荐