明天上午李明要参加奥运志愿者活动，为了准时起床，他用甲、乙两个闹钟叫醒自己，假设甲闹钟准时响的概率是0.80，乙闹钟准时响的概率是0.90，则两个至少有一个响的概率是多少? (水城百事)

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by 太简单了, Wednesday, January 27, 2010, 10:33 @ 考考你的智力

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by 应该是98%, Wednesday, January 27, 2010, 10:59 @ 太简单了

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by ？, Wednesday, January 27, 2010, 11:56 @ 应该是98%

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