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设ç´çº¿Lçæ¹ç¨ä¸º
x+2y-4+λ(2x-y-3)=0
å³ï¼
(1+2λ)x+(2-λ)y-(4+3λ)=0
(1)
(1+2λ)ï¼3=(2-λ)ï¼(-2)
-2-4λ=6-3λ
解å¾ï¼Î»=-8
â´ç´çº¿Lçæ¹ç¨ä¸º
-15x+10y+20=0
å³ï¼3x-2y-4=0
(2)
(1+2λ)·4+(2-λ)·(-3)=0
11λ-2=0
解å¾ï¼Î»=2/11
â´ç´çº¿Lçæ¹ç¨ä¸º
15/11·x+20/11·y-50/11=0
å³ï¼3x+4y-10=0
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