2013年中考二模数学试卷及答案(白下区)(13)

ii）问题：已知PQ为矩形ABCD的边AB、CD上的相似线，且P 是AB的中点，a、b之间有何数量关系？

解答：a＝2b． ········································································································ 12分 iii）问题：已知PQ为矩形ABCD的边AB、CD上的相似线，当a＝2，b＝1时，求AP． 1解答：AP． ··········································································································· 12分

25－1b

iv）问题：已知矩形ABCD＝，PQ为矩形ABCD的边AB、CD上

a2的相似线，求

AP

AD

－1AP

解答：．···································································································· 12分

AD2