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1-x^2+2xy-y^2
ab^2-b^2y-ax+xy+b^2-x
ax^2-2ax-bx^2+2bx^2-b+a
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разложить на множители
1-x^2+2xy-y^2
ab^2-b^2y-ax+xy+b^2-x
ax^2-2ax-bx^2+2bx^2-b+a
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Answers & Comments
ab^2-b^2y-ax+xy+b^2-x =b^2(a-y+1)-x(a-y+1)=(a-y+1)(b^2-x)