Java实现等差数列public int getCha( int n ) { return 1+(n-1)*3; } 版权声明:本文为qq_38006520原创文章,遵循CC 4.0 BY-SA版权协议,转载请附上原文出处链接和本声明。原文链接:https://blog.csdn.net/qq_38006520/article/details/80967832