lim(x趋近于0)[sin6x+xf(x)]/x^3=0,则lim(x趋近于0)[6+f(x)]/x^2=?
rt
人气：365 ℃ 时间：2019-08-18 19:00:16
解答
lim(x趋近于0)[6+f(x)]/x^2=lim(x趋近于0)6/x^2+lim(x趋近于0)f(x)/x^2=lim(x趋近于0)sin6x/x^3+lim(x趋近于0)xf(x)/x^3=lim(x趋近于0)[sin6x+xf(x)]/x^3=0.
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