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次の式を因数分解しなさい。
① 8x2y−16xy8x^2y-16xy8x2y−16xy (a)
② 5x2y−35xy5x^2y-35xy5x2y−35xy (a)
③ 3x2y−6xy2+18xy3x^2y-6xy^2+18xy3x2y−6xy2+18xy (a)
④ 8x2y−4xy2+36xy8x^2y-4xy^2+36xy8x2y−4xy2+36xy (a)
⑤ a2+4a−45a^2+4a-45a2+4a−45 (a)
⑥ a2+12a+20a^2+12a+20a2+12a+20 (a)
⑦ x2−14x+24x^2-14x+24x2−14x+24 (a)
⑧ x2−2x−35x^2-2x-35x2−2x−35 (a)
⑨ x2−9xy+8y2x^2-9xy+8y^2x2−9xy+8y2 (a)
⑩ x2−10xy+9y2x^2-10xy+9y^2x2−10xy+9y2 (a)
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