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X y dx. (Y-X)DX+(Y+X)dy=0 решение. Y dy/DX. Dy/y=DX/X-1. (X-Y)DX+(X+Y)dy=0.
(Y-X)DX+(Y+X)dy=0 решение. Y dy/DX. Dy/y=DX/X-1. (X-Y)DX+(X+Y)dy=0.

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