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這是一個二元二次方程的轉換.解析如下: 設甲邊長為xcm,乙邊長為ycm,有以下方程: x+y=20(1) x2-y2=40(2) 將(1)平方與(2)相加得: 2 x2+2xy=440約分選取公因式 X(x+y)=220 得出x=11,y=9
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