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初级微积分 示例 √xx 将√xx的被开方数设为大于或等于00,以求使表达式有意义的区间。 x≥0x≥0 定义域为使表达式有定义的所有值xx。 区间计数法: [0,∞)[0,∞) 集合符号: {x|x≥0}{x|x≥0} 输入您的问题