分解因式:(1)9x3y3-21x3y2+12x2y2; (2)x2(x-y)+y2(y-x);(3)(x-y)2+2(x-y)w+...
分解因式:(1)9x3y3-21x3y2+12x2y2;(2)x2(x-y)+y2(y-x);(3)(x-y)2+2(x-y)w+w2;(4)(p-4)(p+1)+3p....
分解因式:(1)9x3y3-21x3y2+12x2y2; (2)x2(x-y)+y2(y-x);(3)(x-y)2+2(x-y)w+w2; (4)(p-4)(p+1)+3p.
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