数学的浪漫

∣ 5 2 1 1 2 5 34 1 34 ∣ = 520 \left \lvert \begin {array} {ccc} 5 & 2 & 1 \\ 1 & 2 & 5 \\ 34 & 1 & 34 \end {array} \right \rvert = 520 ∣∣∣∣∣∣​5134​221​1534​∣∣∣∣∣∣​=520 r = a ( 1 − c o n θ ) r=a(1-con\

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