当X趋向0时,3-(2x+9)^(1/2)除以sin3x,请问sin3x能直接用无穷小等量~X代替吗,我主要是想问。当X趋向0时,3-(2x+9)^(1/2)除以sin3x。sin3x能直接用无穷小等量~因为我知道课本里有说过,无等小等量替
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![当X趋向0时,3-(2x+9)^(1/2)除以sin3x,请问sin3x能直接用无穷小等量~X代替吗,我主要是想问。当X趋向0时,3-(2x+9)^(1/2)除以sin3x。sin3x能直接用无穷小等量~因为我知道课本里有说过,无等小等量替](/uploads/image/z/14558721-33-1.jpg?t=%E5%BD%93X%E8%B6%8B%E5%90%910%E6%97%B6%2C3-%282x%2B9%29%5E%281%2F2%EF%BC%89%E9%99%A4%E4%BB%A5sin3x%2C%E8%AF%B7%E9%97%AEsin3x%E8%83%BD%E7%9B%B4%E6%8E%A5%E7%94%A8%E6%97%A0%E7%A9%B7%E5%B0%8F%E7%AD%89%E9%87%8F%7EX%E4%BB%A3%E6%9B%BF%E5%90%97%2C%E6%88%91%E4%B8%BB%E8%A6%81%E6%98%AF%E6%83%B3%E9%97%AE%E3%80%82%E5%BD%93X%E8%B6%8B%E5%90%910%E6%97%B6%EF%BC%8C3-%282x%2B9%29%5E%281%2F2%EF%BC%89%E9%99%A4%E4%BB%A5sin3x%E3%80%82sin3x%E8%83%BD%E7%9B%B4%E6%8E%A5%E7%94%A8%E6%97%A0%E7%A9%B7%E5%B0%8F%E7%AD%89%E9%87%8F%7E%E5%9B%A0%E4%B8%BA%E6%88%91%E7%9F%A5%E9%81%93%E8%AF%BE%E6%9C%AC%E9%87%8C%E6%9C%89%E8%AF%B4%E8%BF%87%EF%BC%8C%E6%97%A0%E7%AD%89%E5%B0%8F%E7%AD%89%E9%87%8F%E6%9B%BF)
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