一道数学难题,求解答,谢谢
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百度网友7a2bf4f
2018-06-08
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1 如图:
![](https://iknow-pic.cdn.bcebos.com/9c16fdfaaf51f3de0b864afb98eef01f3a29797d?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
2 如图 :
![](https://iknow-pic.cdn.bcebos.com/63d0f703918fa0ec04af468d2a9759ee3c6ddbc1?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
PE 长度=1.157 .
3 如图 :
![](https://iknow-pic.cdn.bcebos.com/42166d224f4a20a4480a29479c529822720ed01d?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
AC:BC=5:8.09=0.618 .回答完毕。
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mbcsjs
2018-06-08
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![](https://iknow-pic.cdn.bcebos.com/9345d688d43f8794557baeb1de1b0ef41ad53aad?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
图
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