求y=(x-1)x^2/3二阶导数是多少？？
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复合函数求导外导乘以内导
y'=x^(2/3)+2/3(x-1)x^(-1/3)
=x^(2/3)+2/3*x^(2/3)-2/3*x^(-1/3)
=5/3*x^(2/3)-2/3x^(-1/3)
y''=5/9*x^(-1/3)+2/9x^(-4/3)
y'=x^(2/3)+2/3(x-1)x^(-1/3)
=x^(2/3)+2/3*x^(2/3)-2/3*x^(-1/3)
=5/3*x^(2/3)-2/3x^(-1/3)
y''=5/9*x^(-1/3)+2/9x^(-4/3)
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