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MGSM / 布兰登的 iPhone 手机比本的 iPhone 手机旧三倍。本的 iPhone 手机比 苏茜的 iPhone 手机旧两倍。如果苏茜的 iPhone 手机使用了…

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布兰登的 iPhone 手机比本的 iPhone 手机旧三倍。本的 iPhone 手机比 苏茜的 iPhone 手机旧两倍。如果苏茜的 iPhone 手机使用了 1 年,则 布兰登的 iPhone 手机有多旧?

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