Despite having received positive reviews by industry critics, sales of the digital MP3 player have been quite _______(disappoint).
disappointing
暂无解析
设 A，B 为随机事件，试证：P(A)=P(A--B)+P(AB) ．
设随机变量(X,Y)服从二维正态分布N(0,0;1,4;-1/2),随机变量中服从标准正态分布且与X独立的是()
Weallthinkthat_____noneedtomakelawstopreventtheyoungfromgettingmarriedduringtheircollegelife.
求二元函数f(x,y)=x3+8y3-xy的极值。
