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AbstractCalculator is an auxiliary class that provides auxiliary methods. Next, implement each of the following classes in turn:Analysis: It mainly lies in retaining the plus and minus signs. The result is NaN, but note that NaN is not equal to all values, including itself."The practical activities are over. I'd like to share my harvest with you and thank the general managers for their help. You should lead everyone with your speech. We should make college students a position to cultivate talents with good moral character and high intelligence quotient!" On the day the activity ended, Teacher Sun sent a message to the captain. Mr. Sun Yimin always faces every student activity with the greatest enthusiasm. He can always think of problems that the team members have not considered. Not only that, the teacher also participated in the interaction with us and asked questions about college students' entrepreneurship and employment when facing the leaders of the enterprise to make this practice more exciting and full.蒯彻笑道：如此元帅的怨恨可消了？那是自然了，其实广野君也算是给我们帮忙了，本帅不该恨他的。漫画作者毛豆子反复删改漫画，导致画中大反派苏望崩溃来到现实世界“逼迫”作者给自己一个了结的故事，但两人却在相处中产生了感情，一起应对已经来到现实世界十年之久的漫画男主角江霖给两人造成的危机。改革开放初期，黎小军（黎明 饰）告别女友小婷（杨恭如 饰）从天津来到香港讨生活，期望有天挣到大钱把小婷接来与之风风光光地成婚，没料想日子会比想象中的难熬许多。 　　黎小军在快餐店与同样从大陆到港讨生活但避讳谈自己身份的李翘（张曼玉 饰）结识后，因为共同喜爱邓丽君，两人人在异乡的孤独都有 了某种程度的缓解，并在交往的过程中生出了真爱，可是世事难料，两人最终无奈分手，黎小军成了小婷的老公，李翘跟了在黑社会做事的豹哥（曾志伟 饰）。然而因为邓丽君，两人的缘分并没到此为止。