求水平渐近线和垂直渐近线

f(x) = 6x^2/(x^2-4x)定义域：x不等于0，x不等于4.lim(x->无穷）f(x) = lim(x->无穷）6x^2/(x^2-4x) = lim(x->无穷）6/(1-4/x) = 6/1 = 6,水平渐近线：y = 6.lim(x->0)f(x) = lim(x->0)6x^2/(x^2-4x) = lim(x->+0)6x/(x-4) = 0/(-4) = 0,lim(x->4+)f(x) = lim(x->4+)6x^2/(x^2-4x) = lim(x->4+)6x/(x-4)=+无穷lim(x->4-)f(x) = lim(x->4-)6x^2/(x^2-4x) = lim(x->4-)6x/(x-4)=-无穷,垂直渐近线：x = 4.

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