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AbstractCalculator is an auxiliary class that provides auxiliary methods. Next, implement each of the following classes in turn:尤其是这背水一战，可以说是一种很到的冒险，能否成功还是不得而知的。二世皇帝深宫淫乐，不问政事，赵高指鹿为马，祸乱朝纲，已然没有xiwang。Why is feedback so useful for deliberate practice? In the article "Failure is not the Mother of Success, Success is the Mother of Success" by Teacher Wan Weigang, it is stressed that feedback is divided into two types: one is to accuse you of not being able to do it yourself, and this feedback will bring bad effects. 2 refers to the right thing, not that you can't do it, but that what you do can be better promoted through improvement. Effective feedback is that "good is failure" needs to meet three conditions. 1. Timely, if it is wrong, someone will point it out to you immediately. It is not right for people to be right for things. The cost of mistakes is small. This is more like the green light thinking in the learning mentality. To distinguish between "I" and "my view of behavior". I am very good myself, and my behavior and opinions can be changed.转头对她看了看，忽见她头上戴着几片红叶，觉得有趣，不禁微笑起来。"What does this era rely on to separate good people from untouchables? Relying on legal documents? Don't be stupid, although the illiteracy rate in this era is not as high as 90%, there are also more than 80%! The vast majority of people don't say it is...Screen