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因数分解せよ。
① x2−6x+9x^2-6x+9x2−6x+9 (a)
② x2−18x+81x^2-18x+81x2−18x+81 (a)
③ x2−25x^2-25x2−25 (a)
④ x2−121x^2-121x2−121 (a)
⑤ x2+20xy+100y2x^2+20xy+100y^2x2+20xy+100y2 (a)
⑥ x2−2xy+y2x^2-2xy+y^2x2−2xy+y2 (a)
⑦ 4x2+4x+14x^2+4x+14x2+4x+1 (a)
⑧ 25x2+10x+125x^2+10x+125x2+10x+1 (a)
⑨ 4a2−b24a^2-b^24a2−b2 (a)
⑩ a2−36b2a^2-36b^2a2−36b2 (a)
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