:..、选择题下列各式公因式是a的是()+ay+-+-2a+ma-6xyz+3xy2-9x2y的公因式是()A.-.-3xy把多项式(3a-4b)(7a-8b)+(11a-12b)(、()+ay+-+-2a+ma2.-6xyz+3xy2-9x2y的公因式是()A.-.-(3a-4b)(7a-8b)+(11a-12b)(8b-7a)分解因式的结果是()(7a-8b)(a-b);(7a-8b)2;(7a-8b)(b-a);D.-2(7a-8b)(x-y)2-(y-x)分解因式为()A.(x-y)(x-y-1)B.(y-x)(x-y-1)C.(y-x)(y-x-1)D.(y-x)(y-x+1)()+6ac2+2ac=2ac(5b2+3c)B.(a-b)3-(b-a)2=(a-b)2(a-b+1)(b+c-a)-y(a-b-c)-a+b-c=(b+c-a)(x+y-1)D.(a-2b)(3a+b)-5(2b
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