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【简答题】
设有甲、乙、丙二门炮，同时独立地向某目标射击命中率分别为0.2，0.3，0.5，目标被命中一发而被击毁的概率为0.2，被命中两发而被击毁的概率为0.6，被命中三发而被击毁的概率为0.9，求： (1) 三门炮在一次射击中击毁目标的概率； (2) 在目标被击毁的条件下，只有甲炮击中的概率．
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