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設兩條直角邊分別為x,y 那麼根據畢氏定理: x^2+(y/2)^2=25 (x/2)^2+ y^2=40 相加得到:5/4×(x^2+y^2)=65 那麼x^2+y^2=52 則斜邊長度為根號52=2根號13 樓主畫個圖就好理解了.
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