f(x)=100^x-1=1000 (x-1)lf100=lg1000 (x-1)=3/2f(x)=100^x-1=1000 (x-1)lf100=lg1000 (x-1)=3/2 x=5/2 f^-1(1000)=5/2,我想知道lf是什么,怎么来的!怎么移动变为3/2,大神看14题

设函数f(x)=(x-1)(x-2)...(x-100)(x>100),求F'(X) f(x)=x(x-1)(x-2)…(x-99)(x-100),求f'(100) 已知x=100时f(x)=5,x=1000时f(x)=1,x=10000时f(x)=0.2,求f(x). f(x)-xf(-x)=1/x,求f(x) 设f(x)=x(x-1)(x-2).(x-1000) 则f'(0)=?RT f(x)=x(x-1)(x-2)…(x-100),求f'(100). 设f(x)=x(x+1)(x+2).(x+100),则f '(0)= 设f(x)=x(x-1)(x-2)……(x-100)求,f'(1) f(x)=x(x-1)(x+2)(x-3)(x+4)……(x+100),求f'(1) 设f(x)=1/x(x 设f(x)=1-x,(x f(x)={2x+1,x f(x)={1+x/2,x f(x)=(x-1)/(x+2) f(x)=lnx-(x-1)/x f(x)=x,x f(x)+f((x-1)/x)=2x; x!=0,1; 求f(x) f(x)+f[(x-1)/x]=2x x不等于0,1.求f(x).