
AD=AE,FB=FC. 能不能证明 FD=FE?

AD=AE,FB=FC. 能不能证明 FD=FE?
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用反证法可以证明。如果把AD=AE换成 AB=AC,结论也成立。
-yma16-
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07/20/2018 postreply
09:46:46
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前提:EFB和DFC必须是直线。
-SciTech-
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09/28/2018 postreply
07:44:31
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