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增根必為使分母為0的值,即x=2為增根 去分母:3-(k-1)=4(x-2) 將x=2代入上式得;3-(k-1)=0 得k=4 3-(k-1)=4(x-2) ∵分式方程有增根 ∴x=2 ∴3-(k-1)=0 k=4
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