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帶進去很醜,請問要怎麼判斷

9 下列哪一個選項是方程式7x²-2x²+14x²-4x²+7x2=0的根? (1)-1 (2) (3) (4) (2)÷(3)--(4)- (5)-2. 7 7 解 (4)

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✨ Jawaban Terbaik ✨

7x⁵-2x⁴ + 14x³-4x² + 7x-2
= x⁴(7x-2) + 2x²(7x-2) + (7x-2)
= (7x-2)(x⁴+2x²+1)
= (7x-2)(x²+1)²

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