因式分解(1)3ax+6ay(2)25m2﹣4n2(3)3a2+a﹣10(4)ax2+2a2x+a3(5)x3+8y3(6)b2+c2﹣2bc﹣a2(7)(a2﹣4ab+4b2)﹣(2a﹣4b)+1(8)(x2﹣x)(x2﹣x﹣8)+12.
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