一张矩形纸片沿对角线剪开得到两张三角形纸片再将这两张三角形纸片�成如下右图形式使点bfcd在同一条直线上 1求证ab⊥ed Template




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tomski一张矩形纸片沿对角线剪开得到两张三角形纸片再将这两张三角形纸片�成如下右图形式使点bfcd在同一条直线上 1求证ab⊥ed coloring