(5-x)*x^2/3求导
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(5-x)*x^2/3求导
(5-x)*x^2/3求导
(5-x)*x^2/3求导
y=(5-x)*x^(2/3)=5x^(2/3)-x^(5/3)
所以y'=5*(2/3)x^(2/3-1)-(5/3)*x^(5/3-1)
=(10/3)x^(-1/3)-(5/3)x^(2/3)
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-x^2/3+(5-x)*3/2*x^-1/3