1+3+7+9+…+(2n-1)+(2n+1)+(2n+3)等于几

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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+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