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When I lived with my father, I _______ much knowledge _______ him. I never _________ such a thing. But ___________ tell me quickly what I have to do. This job has quite _________ me ______. I don't _________ much _______ music. He ______________ his work. He could not ________ such questions __________. Don't worry about price-----I'm sure we can come to _____________arrangement.
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【简答题】把 3 4 的分子扩大到原来的3倍，要使分数的大小不变，分母应该______．
【简答题】把5/12的分子扩大3倍,要使分数的大小不变,它的分母应该( )。
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