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今年安徽理科数学试卷学生普遍感觉难度较大,特别是第16题第一问出乎大家意料.学生拿到题乍一看好像很容易下手,可是从学生那了解到,将角的关系转化成正弦问题后再怎么走,难住了不少同学.本文对该题第一问给出多种解法,多方位研究此题.通过经历这些解法的发现的历程,拓宽解决问题的途径.一、例题与解答例1(2014安徽省高考)设△ABC的内角A,B,C所对边的长分别为a,b,c,且b=3,c=1,A=2B.(Ⅰ)求a的值;(Ⅱ)
This year, students in Anhui science mathematics papers generally feel more difficult, especially the first question asked question 16 surprised us.Students get the question at first glance seems very easy to start, but learned from the students that the relationship between the corner into Sine problems and then how to go, hard to live a lot of classmates.This paper first question asked a variety of solutions, multidimensional study of this problem.Through the process of the discovery of these solutions to broaden the way to solve the problem.One, Examples and Solutions Example 1 (2014 Anhui Provincial Entrance Examination) Let the lengths of the opposite sides A, B, and C of △ ABC be a, b and c, and b = 3, c = 1 and A = Find the value of a; (Ⅱ)