設(shè)y = 1/x²,x = ±y^(-1/2)
e^(-1/x^2)/x
= ±e^(-y) / y^(-1/2)
= ±y^(1/2) / e^y
x → 0 等價于 y → ∞
lim[(e^(-1/x^2))/x,x → 0]
= lim[ ±y^(1/2) / e^y,y → ∞ ]
y^(1/2) / e^y 為 ∞/∞ 型,可用洛必達(dá)法則
y^(1/2)求導(dǎo)為(1/2)y^(-1/2),e^y求導(dǎo)為e^y
lim[(e^(-1/x^2))/x,x → 0]
= lim[ ±y^(1/2) / e^y,y → ∞ ]
= lim[ ±(1/2)y^(-1/2) / e^y,y → ∞ ]
= lim[ ±1 / 2y^(1/2)e^y,y → ∞ ]
= 0