y=(x/128000-3x/80+8)*100/x,求导
问题描述：
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……
答
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^3/1...