#18531. 第四章：for循环结构《练习4:求s=11+22+33+..+nn 》
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ID: 18531
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第四章：for循环结构《练习4:求s=11+22+33+..+nn 》
说明
输入一个整数n，求s=11+22+33+..+nn (n<=9)
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