摘要：把下列各式因式分解. (1)x2-2x3 (2)3y3-6y2+3y (3)a22-a2 2-x+2 (5)25m2-10mn+n2 (6)12a2b 2a2+5a+6 (9)x2-11x+24 (10)y2-12y-28 (11)x2+4x-5 (12)y4-3y3-28y2

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