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這麼解你看你能不能看懂,連接op角opq=角qop,我們又知道角opq=角odp角odp=1/2角pob,角pob+角qop=90度,所以知道角qop=30度這樣三角形opq就是兩個底角為30度,頂角是120度的三角形oq=x的話,op=根號3倍的x=od=cd除以根…
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