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兩邊乘(x+3)(x-3) m+2(x-3)=(x+3) 增根就是公分母為0 (x+3)(x-3)=0 x=-3,x=3 x=-3,代入m+2(x-3)=(x+3),m-12=0,m=12 x=3,代入m+2(x-3)=(x+3),m+0=6,m=6 所以m=6,m=12
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