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View Compilation Error

0_0_18345414_14953\Main.java:8: 错误: 找不到符号
					    sum=n/2*(n+1);
					    ^
  符号:   变量 sum
  位置: 类 Main
0_0_18345414_14953\Main.java:10: 错误: 找不到符号
				      sum=(n+1)/2*n;
				      ^
  符号:   变量 sum
  位置: 类 Main
0_0_18345414_14953\Main.java:12: 错误: 找不到符号
			     System.out.println(sum);
			                        ^
  符号:   变量 sum
  位置: 类 Main
3 个错误


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