y=(x/128000-3x/80+8)*100/x,求导
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y=(x/128000-3x/80+8)*100/x,求导
y=(x/128000-3x/80+8)*100/x,用导数求出极限…要详细步骤……
y=(x/128000-3x/80+8)*100/x,用导数求出极限…要详细步骤……
![y=(x/128000-3x/80+8)*100/x,求导](/uploads/image/z/19066344-24-4.jpg?t=y%3D%28x%2F128000-3x%2F80%2B8%29%2A100%2Fx%2C%E6%B1%82%E5%AF%BC)
y=(x^3/128000-3x/80+8)*100/x=(x^3/128000-3x/80+8)*100x^(-1) y'=[(x^3/128000-3x/80+8)*100x^(-1)]' =(x^3/128000-3x/80+8)'*100x^(-1)+(x^3/128000-3x/80+8)*[100x^(-1)]' =(3x^2/128000-3/80)*100x^(-1)+(x^3/128000-3x/80+8)*100*(-1)x^(-2) =(3x^2/128000-3/80)*100x^(-1)-(x^3/128000-3x/80+8)*100x^(-2) =[(3x^3/128000-3x/80)-(x^3/128000-3x/80+8)]*100x^(-2) =100(x^3/64000-8)*x^(-2) 如有不妥请回复.