Вариант 2 (6A)

X/Y X1/Y1

U=X-Y U1=X1-Y1

V=X+Y V1=X1+Y1

U ? U1 V ? V1

X-Y ? X1-Y1 X+Y ? X1+Y1

X-X1 ? Y-Y1 X-X1 ? Y1-Y

DistX ? Y-Y1 DistX ? Y1-Y

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