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高考数学选择题,题目多,分值高.对其中的一些计算型题目,如果循规蹈矩、按步就班地演算——小题大作,势必费时费力,影响整套试卷的完成.如果针对题目的特点,施行合乎情理的“估算”,则可快速获解.本文结合近几年高考数学选择题,谈谈“估算法”的应用技巧. 一、选择特值、特例、特殊位置估算 1.选取特值估算 例1(2000年春季高考题)函数y=1/(2+sinx+cosx)的最大值是( ).
College entrance examination mathematics multiple-choice questions, many questions, high scores. For some of the computational problems, if the rules, step by step calculations - a fuss, will inevitably take time and effort, affect the completion of the entire examination paper. If the characteristics of the problem The reasonable “estimate” can be quickly solved. This paper combines the mathematics multiple-choice questions of the college entrance examination in recent years to talk about the application skills of the “estimation method.” First, choose special value, special case, special position estimate 1. Select special Value evaluation example 1 (in the spring of 2000 college entrance examination question) The maximum value of the function y = 1/(2+sinx + cosx) is ().