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问题: y=根号下x

求二阶导数的

解答:

y=根号下x
y=√x =x^(1/2)
y′=(1/2)*x^(-1/2)
y″=(1/2)*(-1/2)*x^(-3/2)
=(-1/4)*[1/x^(3/2)]
=(-1/4)*[1/(x*√x)]
=(-1/4)*[√x/(x^2)]
=-√x/(4x^2)