來自 The Mathematics Initiative, Education Development Center 的關於 Cramer’s rule 的無言證明：
兩句：
1.相信為了簡潔，不繪出 
2.上式 det 計算的是平行六面體體積，而上圖兩個平行六面體之體積明顯相同，故推得結果。
把線性方程組賦予這個圖像意義，美麗！
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