高等数学,求极限。速度,在线。
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(2),罗贝塔法则,
lim_{x->无穷}[x^2+x-1]/e^x = lim_{x->无穷}[2x+1]/e^x = lim_{x->无穷}[2/e^x] = 0.
(4), x^x = e^[xlnx],
lim_{x->0+}xlnx = lim_{x->0+}[lnx]/(1/x) = lim_{x->0+}(1/x)/(-1/x^2) = lim_{x->0+}(-x) = 0.
lim_{x->0+}x^x = e^0 = 1.
lim_{x->无穷}[x^2+x-1]/e^x = lim_{x->无穷}[2x+1]/e^x = lim_{x->无穷}[2/e^x] = 0.
(4), x^x = e^[xlnx],
lim_{x->0+}xlnx = lim_{x->0+}[lnx]/(1/x) = lim_{x->0+}(1/x)/(-1/x^2) = lim_{x->0+}(-x) = 0.
lim_{x->0+}x^x = e^0 = 1.
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