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_________ (游泳) for some time after a tiring day is very enjoyable and exciting for me in summer.
1年前
在同一平面直角坐标系中,一次函数y=ax+b和二次函数y=ax2+bx的图象可能为:
1年前
There is something wrong with my ________.
1年前
Which would you like to drink, coffee, yogurt or orange juice?
1年前
设随机变量X~U[0,1],Y=X^2-4X+1,求: (1)随机变量Y的概率密度; (2)EY和DY; (3)X与Y的相关系数.
1年前