设f (x)={2x+1(x≥0),x²+4(x

设函数f(x)=x-[x],x≥0,f(x+1),x 设f (x)={2x+1(x≥0),x²+4(x 设函数f(x)=a/(1+x),x≥0；2x+b,x 设f(x)={3x-1,x=0,求f(-x),f(x-2). 设f(x)=x㏑(1+x^2),x≥0.(x^2+2x-3)e^(-x),x＜0,求∫f(x)dx 设f(x-1)={-sinx/x,x>0;2,x=0;x-1,x 设f(x-1)={-sinx/x,x>0;2,x=0;x-1,x 设函数f(x)={(1/2)^x(x≥4),f(x+3)(x 设f(x)=x(x-1)(x-2)...(x-999),则f'(0)=? 设f(x)=x(x-1)(x-2).(x-1000) 则f'(0)=?RT 设f(x)=x(x+1)(x+2).(x+100),则f '(0)= 设f(x)=x/2+1/x(x 设f(x)={|x-1|-1(x>0) {x2-2x-3(x≤0),解不等设f(x)={|x-1|-1(x>0){x2-2x-3(x≤0),解不等式f(x)≥0 分段函数求极限设函数f(x)=｛x ,x≥0 x ,x设函数f(x)=｛x ,x≥0 1 ,x 设函数f（x）={x^2+bx+c,x≥0；1,x 设函数f(x)=(1/2）^x(x≥4), f(x)=f(x+3)(x 设函数f(x)满足f(x)+2f(1/x)=x,求f(x) 设f(x)=1/x(x