以环境要素数据为自变量，样点单位面积生物量为因变量，采用二元四次多项式建立趋势方程并生成立体模型。
On the support of GIS technology and through the method of net sampling, the data of basic environmental elements and biomass per acreage of sampling sites were obtained.
本文首先阐述了四次多项式拟合的基本原理以及精度评定方法，然后具体算例，实际计算分析了此种拟合方法的精度。
Firstly, the author discusses the theory of the fitting method and precision estimate, and then analyzes the precision through calculating a practical example.
研究两个多项式的根的相对分布的显式判定问题，得出两个三次多项式的根的相对分布以及二次和四次多项式的根的相对分布的显式判定。
We obtain the relative distribution of roots of two polynomials whose degrees are respectively 2 and 4, and we answer the same problem about the two polynomials of degree 3.
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