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□38 次の式を因数分解せよ。 x-ax-6x+3a +9 0²1=2017 +6²) + 344 34

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✨ Best Answer ✨

↓①項を並び替えて
(-ax+a)+(x²-6x+9)
↓②因数分解
= -a(x-3)+(x-3)²
↓③A (x-3)+B (x-3)=(A+B) (x-3)だから
=(x-3)((x-3)-a)
=(x-3)(x-a-3)

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ありがとうございます!!!

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