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she er bu qiu , yong chu duo duo
Author(s): 
Pages: 25-26
Year: Issue:  10
Journal: Required Reading for Junior Middle School Students

Keyword:  未知元数学问题解题思路水流速度题设条件平分线过渡作用船上;
Abstract: <正>在我们习惯的解题思路中,未知元总是设而必求.其实,在许多数学问题中,不一定要将所设的未知元求出,有时对过渡的未知数,我们也可以"设而不求".1.几何中求角的度数例1如图1,∠AOC=70°,∠BOC是锐角,OD平分∠BOC,OE平分∠AOB,求∠DOE的度数.分析直接求∠DOE的度数较困难,注意到∠DOE=∠DOC+∠COE,可设∠DOC=x,∠COE=y,再计算x+y的值.
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