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Today a certain machine is worth 20 percent less than it was worth a year ago, and it is worth x percent less than it was worth two years ago. A year ago the machine was worth 20 percent less than it was worth two years ago.
Quantity A： x
Quantity B： 40
Quantity A： x
Quantity B： 40
B显示答案
以上解析由 考满分老师提供。
