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設1/x=X,1/y=Y X+Y=1...(1) 5X+(Y+X)*9=1...(2) 由(1)得Y=1-X 代人(2) 5X+(1-X+X)*9=1 5X+9=1 X=-8/5 Y=1-(-8/5)=13/5 x=1/X=-5/8 y=1/Y=5/13
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