Photos X 1 9 2X X2

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X 1 9 2x x2. (X+Y)^2 формула. X2-y2 формула. X^2/A^2+Y^2/B^2=1. X2y+1-x2-y.
(X+Y)^2 формула. X2-y2 формула. X^2/A^2+Y^2/B^2=1. X2y+1-x2-y.

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