【单选题】设服从[0,1]上的均匀分布, 则( )。
【单选题】设X,Y相互独立且均服从[0,1]上的均匀分布,则服从区间或区域上的均匀分布的随机变量是( )
【单选题】I'm pleased to tell you that the machine you ordered are now.
【单选题】I'm pleased to tell you that the fax machines you ordered are _______ now.
【单选题】I'm pleased to tell you that the fax machines you ordered are _______ now.
【单选题】I'm pleased to tell you that the fax machines you ordered are ________ now.
【单选题】水的导电性能与水的纯度有关。下列说法正确的是。
【简答题】利用求根公式解一元二次方程时,首先要把方程化为( ),确定( )的值,当( )时,把 a , b , c 的值代入公式,x 1 ,x 2 =( )求得方程的解.