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填空题从某公司生产的安全带中随机抽取10条进行断力测试，测试结果（单位：kg）如下：3722 3872 4004 4012 3972 3778 4022 4006 3986 4026则该样本的样本方差为（）kg²（精确到0.1）
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填空题不等式的解集为（）
填空题已知A2，1，B3，-9，直线z：5χ+y-7=0与直线AB交于P点，点P分AB所成的比为__________．
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填空题已知的值等于__________
填空题掷一枚硬币时，正面向上的概率为12，掷这枚硬币4次，则恰有2次正面向上的概率是（）
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填空题已知的值域为__________
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单选题
单选题 D You know what a hotel is, of course. perhaps, you also know what a condo is--a residential（居住的）building divided into separate unionist that are owned by different people. What you may not know is
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单选题 C Many schools have their art programs removed in an effort to improve test scores money. However, some researchers believe that this is not correct. Students can some basic skills in art class that
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