问题标题:
y=(x-1)乘三次根号下x的平方,令Y的导数等于0,那么如何求X的值?
问题描述:
y=(x-1)乘三次根号下x的平方,令Y的导数等于0,那么如何求X的值?
郭玺回答:
y=(x-1)乘三次根号下x²=(x-1)*x^(2/3)y'=(x-1)*[x^(2/3)]'+(x-1)'*x^(2/3)=(x-1)*2/3*x^(-1/3)+1*x^(2/3)=2/3(x-1)*x^(-1/3)+x^(2/3)=2/3(x-1)/x^(1/3)+x^(2/3)=[2/3(x-1)...
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