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因数分解: (i) `x^3-2x^2-x+2` (ii) `x^3-3x^2-9x-5` (iii) `x^3+13 x^2+32 x+20` (iv) `2y^3+y^2-2y-1`

Factorise x³-3x²-9x-5

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x^3-3x^2-9x-5 | を因数分解します。多項式 |例 2.4 クラス 9 [Q5 (ii)]

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