求翻译：本文以2011年高考理科数学全国卷、辽宁卷、福建卷为研究对象，通过建立综合难度模型来比较研究这三份试卷的综合难度。本文提取了影响试题难度的五个主要因素，即试题的探究水平、背景水平、知识含量、推理水平和运算水平。每个因素又进一步划分为不同的等级，再计算出每个等级的题量大小，根据等级权重,利用下面的加权平均公式分别计算出三份试卷在每个因素上的加权平均数：是什么意思？

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This paper provides a mathematical science College in 2011, the Liaoning Province, Fujian volume as the object of study, through the creation of integrated study difficult model to compare the 3 papers of the difficulty. This article takes the impact of the difficult questions, and 5 of the main fac

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This 2011 year national volumes, Liaoning, Fujian Science Mathematics volume for the study, through the establishment of integrated model to comparisons difficult to study the general difficulty of the three papers. This extract has five major factors affecting test questions difficulty, level of re

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