求2个概率题:1,5封信随机投进甲,乙两个空信箱,两个信箱都有信的概率为?
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求2个概率题:1,5封信随机投进甲,乙两个空信箱,两个信箱都有信的概率为?
2,6个运动队中有2个强队,先任意将6个队分成2组,每组3个队进行比赛,则这两个强队被分到同一组的概率为?一共2个题
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举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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