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(2)-2xy-x²-y²=-(x²+2xy+y²)=-(x+y) ²;
(3)3ax²+6axy+3ay²=3a(x²+2xy+y²)=3a(x+y) ²;
(4)(a+b)-a²(a+b)=(a+b)(1-a²)=(a+b)(1+a)(1-a).
(2)(x²-2y)-1+2y)(x²-2y+1-2y)=(x²-1)(x²-4y+1)=(x+1)(x-1)(x²-4y+1);
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