求一个不好算的积分∫(1/(x+dx))*dx=?补充,金属形变的题目一吨高线Q235,直径φ10mm,经过冷拔,圆径变成φ9.5的冷拔光圆钢筋.求过程中消耗的最小能量.(冷拔过程不消耗原材料,产出的钢筋还是一吨
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![求一个不好算的积分∫(1/(x+dx))*dx=?补充,金属形变的题目一吨高线Q235,直径φ10mm,经过冷拔,圆径变成φ9.5的冷拔光圆钢筋.求过程中消耗的最小能量.(冷拔过程不消耗原材料,产出的钢筋还是一吨](/uploads/image/z/10876690-10-0.jpg?t=%E6%B1%82%E4%B8%80%E4%B8%AA%E4%B8%8D%E5%A5%BD%E7%AE%97%E7%9A%84%E7%A7%AF%E5%88%86%E2%88%AB%281%2F%28x%2Bdx%29%29%2Adx%3D%3F%E8%A1%A5%E5%85%85%2C%E9%87%91%E5%B1%9E%E5%BD%A2%E5%8F%98%E7%9A%84%E9%A2%98%E7%9B%AE%E4%B8%80%E5%90%A8%E9%AB%98%E7%BA%BFQ235%2C%E7%9B%B4%E5%BE%84%CF%8610mm%2C%E7%BB%8F%E8%BF%87%E5%86%B7%E6%8B%94%2C%E5%9C%86%E5%BE%84%E5%8F%98%E6%88%90%CF%869.5%E7%9A%84%E5%86%B7%E6%8B%94%E5%85%89%E5%9C%86%E9%92%A2%E7%AD%8B.%E6%B1%82%E8%BF%87%E7%A8%8B%E4%B8%AD%E6%B6%88%E8%80%97%E7%9A%84%E6%9C%80%E5%B0%8F%E8%83%BD%E9%87%8F.%EF%BC%88%E5%86%B7%E6%8B%94%E8%BF%87%E7%A8%8B%E4%B8%8D%E6%B6%88%E8%80%97%E5%8E%9F%E6%9D%90%E6%96%99%2C%E4%BA%A7%E5%87%BA%E7%9A%84%E9%92%A2%E7%AD%8B%E8%BF%98%E6%98%AF%E4%B8%80%E5%90%A8)
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