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設梯形的高是h, 直角梯形有面積可以轉成一個長方形的面積+一個三角形的面積(注釋:過有斜邊的上頂角作底邊的垂線,梯形就分成一個長方形和一個三角形) 3h+h*h/2=20 h*h+6h=40 h*h+6h-40=0 (h+10)(h-4)=0 得h1=-10,h2=4 梯形的高不可能是負值,所以梯形的高為4釐米.
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