lim(x趨向於4)(x^2-6x+8)/(x^2-5x+4)

lim(x趨向於4)(x^2-6x+8)/(x^2-5x+4)


lim(x-6x+8)/(x-5x+4)=lim(x-4)(x-2)/(x-4)(x-1)=lim(x-2)/(x-1)x→4 x→4 x→4代入x=4得2/3
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