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某影碟出租店开设两种租碟方式:一种是零星租碟,每张收费1元,但需要20元押金;另一种是会员卡租碟,办卡费每月12元,租碟费每张0.4元.小王经常来该店租碟,假如每月租碟数量为x.(1)写出零星租碟方式应付的金额y1(元)与租碟数量x(张)之间的代数式;(2)写出会员卡租碟方式应付的金额y2(元)与租碟数量x(张)之间的代数式.(3)如果小王这月租30张碟片,他应选择哪种方式租碟?(4)要使两种租碟方式的费用相同,小王每月应租碟多少张?
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