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Z 5 3x 4y. X2+ZX-ZY+y2-2xy. 15x-5xy+7xy=. Z=7x+5x и z=1-10yi. Y2+z2+10y+10z+5x+XY+XZ+ZY=1340.
X2+ZX-ZY+y2-2xy. 15x-5xy+7xy=. Z=7x+5x и z=1-10yi. Y2+z2+10y+10z+5x+XY+XZ+ZY=1340.

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