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建立直角坐標系.設四個頂點a=0,b=x c=m+in d=(m-x)+in則邊b-a=x=c-d c-b=(m-x)+in=d-a對角線c-a=m+in d-b=(m-2x)+in有c-a²+d-b²=m²+n²+m²-4mx+4x²+n²= 2m²+2n²-4m...
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