问题标题:
【y=(x+3)√x求二阶导】
问题描述:
y=(x+3)√x求二阶导
韩德强回答:
y=x√x+3√x
=x^(3/2)+3x^(1/2)
所以y'=3/2*x^(1/2)+3/2*x^(-1/2)
所以y''=3/4*x^(-1/2)-3/4*x^(-3/2)
=3/4*(1/√x-1/x√x)
=3(x-1)/(4x√x)
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