分解因式 x²-6xy+5y²; m²-5m-6; m²-m-6; 3x²+13x-10; 6m²+m-12.x²-2xy+y²-5x+5y-6;x³-x²-x+1;1-x²+4xy-4y²;a²-b²-c²+2bc;计算(a-b)²+2(a-b)(b-c)+(c-b)²

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