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這位同學你好,下次要畫圖的,這是幾何證明的基本要求.證明:因為ABCD是平行四邊形,所以AD=CB,角ACE=角CBF又因為AE//CF,所以角AEB=角CFD,所以角AED=角CFB(等角的補角相等)在三角形ADE和三角形CFB中,角AED=角CFB角AC…
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