为了简化极限的运算过程，对一些不易求解的极限问题化繁为简。
To simplify the calculation of limit and resolve the complicated limit problems, three methods are deduced from the replace property of infinitesimal.
本文在泛灰函数的极限概念基础上，进一步讨论了泛灰函数极限的运算及运算性质，为讨论泛灰函数的连续性以及泛灰函数的导数奠定了基础。
Some definitions of four fundamental operations of grey number and grey function are given in this paper, also we have given the whiting method of grey function.
在高等数学的教学中发现很多学生在函数极限运算方面面临不少问题。
Found many students facing many troubles in higher math's study in the limit of function operation aspect.
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