NHoldRest
 Usage
• NHoldRest是一个属性值，用来指定一个函数中除第一个参数外的所有参数不应被N影响.
Notes
 Further Examples
Usually N goes inside functions and gets applied to each of their arguments.
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This tells Mathematica not to apply N to all but the first argument of f.
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Now all but the first arguments of f are left in their exact form.
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