(XY-X^2)除以X-Y/XY=?
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(XY-X^2)除以X-Y/XY=?(XY-X^2)除以X-Y/XY=?(XY-X^2)除以X-Y/XY=?-X平方Y
(XY-X^2)除以X-Y/XY=?
(XY-X^2)除以X-Y/XY=?
(XY-X^2)除以X-Y/XY=?
-X平方Y
(XY-X^2)除以X-Y/XY=?
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