bearkong89
幼苗
共回答了10个问题采纳率:90% 举报
小题1:(1)设函数解析式为
![](https://img.yulucn.com/upload/4/7e/47ef26311aa3dad0b03b30aed4355354_thumb.jpg)
…………………………………………1分
解出
![](https://img.yulucn.com/upload/a/f2/af2fa9eb9d4472efbd2d2987e36522d8_thumb.jpg)
……………………………………………………………………3分
∴
![](https://img.yulucn.com/upload/0/f6/0f6222f1a4a654b49ce286cf71bedca6_thumb.jpg)
………………………………………………………4分
小题2:(2)求出点P的坐标为(3,2)…………………………………………………6分
∴
![](https://img.yulucn.com/upload/e/30/e3027ead1f1e606d05682f0884a6184b_thumb.jpg)
(0≤m≤6)………………………………………………………8分
小题3:(3)方法一:①当△ACE∽△ODP时(如图1),∠ACO=∠ODP,∵∠ACO=∠COD
∴∠COD=∠ODP ∴AC=OD………………………………………………9分
∴m
![](https://img.yulucn.com/upload/0/5f/05f5b8c2094174de915b3ca459ae238b_thumb.jpg)
=(6−m) 解得:m=2…………………………
![](https://img.yulucn.com/upload/2/a1/2a16f87c258067a308b41b7a0d3b1872_thumb.jpg)
………………………10分
②当△ACE∽△OPD时(如图2),∠ACO=∠OPD, ∵∠ACO=∠COD
∴∠COD=∠OPD,可得△OPD∽△COD,可得OD
2 =DP·DC,
即OD
2 =CD
2 ……………………………………………………11分
(6−m)
2 =(
![](https://img.yulucn.com/upload/d/0f/d0f67c1fa8756aebadf68af2de8318c9_thumb.jpg)
)
2 , 解得:m=
![](https://img.yulucn.com/upload/6/4e/64e07650d90a861040a700688a1409ad_thumb.jpg)
…………12分
方法二:得出AE=
![](https://img.yulucn.com/upload/c/c7/cc79e0c71dfbf630dde4549c5622b142_thumb.jpg)
…………………………………………10分
① 当△ACE∽△ODP时,可求出m=2……………………11分
② 当△ACE∽△OPD时,可求出m=
![](https://img.yulucn.com/upload/6/4e/64e07650d90a861040a700688a1409ad_thumb.jpg)
………………12分
略
1年前
2