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說明:此題不完整. 應該是“求極限lim(x->2)(x^2-6x+8)/(x^2+x-6)”. 原式=lim(x->2){[(x-2)(x-4)]/[(x-2)(x+3)]} =lim(x->2)[(x-4)/(x+3)] =(2-4)/(2+3) =-2/5
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