100),求f‘(7)=?
求导F(x)=(x-1)(x-2)……(x-100),求f‘(7)=?F(x)=(x-1)(x-2)……(x-100),求f‘(7)=?
f'(x)=(x-2)…(x-7)…(x-100) + (x-1)(x-3)...(x-7)……(x-100) +...+(x-1)...(x-6)(x-8)……(x-100) +...+(x-1)...(x-6)(x-7)……(x-100) 所以: f'(7)=(7-1)...(7-6)(7-8)……(x-100) =6*5*4*3*2*1*(-1)*(-2)*...*(-93) =-6!*93!
F'(x)=F(x)/(x-1)+F(x)/(x-2)+...+F(x)/(x-100) (上面仅仅是列了个形式,实际不应该这样写,定义域变了) 当x=7时,上面每一项除了F(x)/(x-7)之外,其余项都是0. F'(7)=(x-1)(x-2)...(x-6)*(x-8)(x-9)...(x-100) =-6!93!
答:f(x)=x(x-1)(x-2)……(x-100)两边取对数得 lnf(x)=lnx+ln(x-1)+ln(x-2)+……+ln(x-1) 两边求导数得 f'(...详情>>
答:详情>>