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如圖,已知△ABC和點O.延長CO到C';,使C';O=CO;延長B';O到B,使BO=B';O;延長AO到A';,使A';O=AO.連接A';B';C';三點就好啦.^_^望採納(重要的是自己多動手多動腦--不懂也可以問老師啊)
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