设随机变量X和Y相互独立且X~E(1),Y~E(2),求Z=X+2Y的概率密度.这题不对Y积分而对X积分不行吗?答案不同哦
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![设随机变量X和Y相互独立且X~E(1),Y~E(2),求Z=X+2Y的概率密度.这题不对Y积分而对X积分不行吗?答案不同哦](/uploads/image/z/9344013-69-3.jpg?t=%E8%AE%BE%E9%9A%8F%E6%9C%BA%E5%8F%98%E9%87%8FX%E5%92%8CY%E7%9B%B8%E4%BA%92%E7%8B%AC%E7%AB%8B%E4%B8%94X%7EE%281%29%2CY%7EE%282%29%2C%E6%B1%82Z%3DX%2B2Y%E7%9A%84%E6%A6%82%E7%8E%87%E5%AF%86%E5%BA%A6.%E8%BF%99%E9%A2%98%E4%B8%8D%E5%AF%B9Y%E7%A7%AF%E5%88%86%E8%80%8C%E5%AF%B9X%E7%A7%AF%E5%88%86%E4%B8%8D%E8%A1%8C%E5%90%97%3F%E7%AD%94%E6%A1%88%E4%B8%8D%E5%90%8C%E5%93%A6)
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