2x2二階矩陣行列式計算器. 對角線展開:. |a1 b1| =a1b2-a2b1. |a2 b2|. |a1 b1 c1|. |a2 b2 c2|=a1b2c3+b1c2a3+c1a2b3-a3b2c1-b3c2a1-c3a2b1. |a3 b3 c3|.
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