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_________________________
Х
(x^2+2xy+y^2)-(x^2-2xy+y^2)
________________________
x
x^2+2xy+y^2-x^2+2xy-y^2
_____________________
4xy
____
4y
Ответ: 4у
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(x^2+2xy+y^2)-(x^2-2xy+y^2)
________________________
x
x^2+2xy+y^2-x^2+2xy-y^2
_____________________
x
4xy
____
x
4y
Ответ: 4у