数学九年级下人教新课标27.2.2相似三角形的应用举例课件.ppt

《数学九年级下人教新课标27.2.2相似三角形的应用举例课件.ppt》由会员分享，可在线阅读，更多相关《数学九年级下人教新课标27.2.2相似三角形的应用举例课件.ppt（25页珍藏版）》请在金锄头文库上搜索。

1、,27.2.2 ,1.: 2.(): 3.(): 4.(): 5.():,1?,2,.紵,绯. ,:,:,.,14.,?,OBOBABABOB, OABOAB, ABOABO90, OABOAB,OBOBABAB,137,1OB1AB2AB274OB.,2:ABCABBCEECBCBCAED,BD120DC60EC50AB,A,D,C,E,B, ADBEDC,ABCECD90, ABDECD, 100,BD120DC60EC50AB(),2:ABCABBCEECBCBCAED,() AD EDEADBBCDEEACDE , BC, BD, AB,DE120BC60BD50AB,𲢽

2、;,3AB=8mCD=12mBD=5m1.6mC,K, , ,(1),F,B,C,D,H,G,l,A,K,(1),F,B,C,D,H,G,l,A,K,EFAC,C,E,ABLCDL ABCDAFH CFK,=,=,FH=8,8mCC,4.ABPC,AB PCDEMNABNPCNAABP,1C,2 1C CM,1.,1.83,60,?,36, ,2.,1m,16m,0.5m, m,8,3.AB,C,ACABACDBCE,DEACAD=35mDC=35mDE =30m,AB?,455015仹,5. 5h.(),A,D,B,C,E,0.8m,5m,10m,2.4m,6a25cm xAB濨ACBDOA:OC=OB:OD=3CD=7cmx,O,xABAB,7.ABCDCBCD=4m,BC=10mCD3012,8.OS,1.5AB,BC1,4BB, BC1.8,.,9AB(B)DDF3mBD򵽴FFG4m1.6mAB,D,F,B,C,E,G,A,10.ABPA12mQB1.60m9.6mAP =x(m)(1)(2)B,? 2. !?,1. , . ,! 2. 򵥵.,