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çï¼æ±å¯¼ï¼å¦ï¼1ãx^2-xy+y^2=c
çå¼ä¸¤è¾¹å¯¹xæ±å¯¼ï¼2x-y-x(dy/dx)+2y(dy/dx)=0
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dy/dx=(2x-y)/(x-2y)ï¼æåæ 2x-y-(x-2y)yâ²=0
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2-yâ²-(1-2yâ²)yâ²+(x-2y)yã=0
2ãe^(-ay)=c1x+c2
-ayâ²e^(-ay)=c₁(ä¸é¶å¾®åæ¹ç¨ï¼
-ayãe^(-ay)-ayâ²(-ayâ²)e^(-ay)=0ï¼å³a²(yâ²)²-ayã=0(äºé¶å¾®åæ¹ç¨ï¼
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