早教吧 育儿知识 作业答案 考试题库 百科 知识分享

122−1+142−1-162−1+…-11002−1=5010150101.

题目详情
1
22−1
+
1
42−1
-
1
62−1
+…-
1
1002−1
=
50
101
50
101
1
22−1
+
1
42−1
-
1
62−1
+…-
1
1002−1
=
50
101
50
101
1
22−1
1122−122−122−122−12−1
1
42−1
-
1
62−1
+…-
1
1002−1
=
50
101
50
101
1
42−1
1142−142−142−142−12−1
1
62−1
+…-
1
1002−1
=
50
101
50
101
1
62−1
1162−162−162−162−12−1
1
1002−1
=
50
101
50
101
1
1002−1
111002−11002−102−102−12−1
50
101
50
101
50
101
5050101101
50
101
50
101
50
101
5050101101
▼优质解答
答案和解析
122−1+142−1-162−1+…-11002−1=12×(222−1+242−1-262−1+21002−1)=12×[2(2+1)(2−1)+2(4+1)(4−1)-2(6+1)(6−1)+…-2(100+1)(100−1)]=12×(12−1-12+1+14−1-14+1+16−1-16+1+…+1100−1-1100+1)=12×...