1+3+7+9+…+(2n-1)+(2n+1)+(2n+3)等于几
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 23:15:10
![1+3+7+9+…+(2n-1)+(2n+1)+(2n+3)等于几](/uploads/image/z/375969-57-9.jpg?t=1%2B3%2B7%2B9%2B%E2%80%A6%2B%282n-1%29%2B%282n%2B1%29%2B%282n%2B3%29%E7%AD%89%E4%BA%8E%E5%87%A0)
1+3+7+9+…+(2n-1)+(2n+1)+(2n+3)等于几
1+3+7+9+…+(2n-1)+(2n+1)+(2n+3)等于几
1+3+7+9+…+(2n-1)+(2n+1)+(2n+3)等于几
=(1+2n+3)+(3+2n+1)+(7+2n-1)+.
=(2n+4)*(n+2)
=2(n+2)的平方
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来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 23:15:10
1+3+7+9+…+(2n-1)+(2n+1)+(2n+3)等于几
1+3+7+9+…+(2n-1)+(2n+1)+(2n+3)等于几
1+3+7+9+…+(2n-1)+(2n+1)+(2n+3)等于几
=(1+2n+3)+(3+2n+1)+(7+2n-1)+.
=(2n+4)*(n+2)
=2(n+2)的平方