f(x)=x(x+1) (x+2)****(x+n),求f(0)求导,
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f(x)={2x+1,x
f(x)={1+x/2,x
f(x)=(x-1)/(x+2)
f(x)+f((x-1)/x)=2x; x!=0,1; 求f(x)
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max{f(x),g(x)}=1/2(f(x)+g(x)+|f(x)-g(x)|
f(x)=x^2+x (x
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若F(x)满足f(x)+2f(1/x)=x,则f(x)=
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f(X)=f(X+2)(x
函数F(x)=2x,x>=1,F(x)=x^2,x