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fen ge tu xing de miao chu
Author(s): 
Pages: 46-47
Year: Issue:  Z2
Journal: Required Reading for Junior Middle School Students

Keyword:  已知条件题设条件图形的阴影部分平分线位线分点;
Abstract: <正>对于已知条件较为特殊的一类面积问题,特别是其中的填空、选择题,在经过对题设条件的考察后,将图形进行巧妙的分割,往往能使结果显现,立即使题目获解.例1如图1,P为平行四边形ABCD边AD上一点,E、F分别为PB、PC的中点,△PEF、△PCD、△PAB的面积分别为S、S1、S2,若S=2,则S1+S2=.
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