辅助线到是先想到那么连了
但没看出来是两个圆的半径...
真是大眼漏神...
____ ┈莈洧伱, _______________________________
______________ 莪还有迣鎅oО __________________________
_____________________________________ ℉orёvēя春ル ________________
欢迎光临贝克街の亡灵吧:
http://post.baidu.com/f?ct=&tn=&rn=&pn=&lm=&sc=&kw=%B1%B4%BF%CB%BD%D6%A4%CE%CD%F6%C1%E9&rs2=0&myselectvalue=1&word=%B1%B4%BF%CB%BD%D6%A4%CE%CD%F6%C1%E9&submit=%B0%D9%B6%C8%D2%BB%CF%C2&tb=on