求limx→0(1-x)^2/x
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求limx→0(1-x)^2/x
求limx→0(1-x)^2/x
求limx→0(1-x)^2/x
limx→0(1-x)^2/x
=limx→0(1+(-x))^(-1/x)*(-2)
=[limx→0(1+(-x))^(-1/x)*]^(-2)
=e^(-2)
e^-2
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