9 10 11题过程谢
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9,f(x)+f(1/x)=(x-1)/(x+1)+(1/x-1)/(1/x+1)
=(x-1)/(x+1)+(1-x)/(x+1)
=0
且x+1≠0,所以f(x)+f(1/x)=0且x≠-1
10,|x|-x>0,所以|x|>x,所以x<0,因为x+1≠0,所以x≠-1,所以定义域为x<0且x≠-1
11,(1),f(x)+f(1/x)=x^2/(1+x^2)+(1/x^2)/(1+1/x^2)
=x^2/(1+x^2)+1/(1+x^2)
=1
(2),f(1)+f(2)+f(1/2)+f(3)+f(1/3)+f(4)+f(1/4)=1/2+1+1+1=3.5
=(x-1)/(x+1)+(1-x)/(x+1)
=0
且x+1≠0,所以f(x)+f(1/x)=0且x≠-1
10,|x|-x>0,所以|x|>x,所以x<0,因为x+1≠0,所以x≠-1,所以定义域为x<0且x≠-1
11,(1),f(x)+f(1/x)=x^2/(1+x^2)+(1/x^2)/(1+1/x^2)
=x^2/(1+x^2)+1/(1+x^2)
=1
(2),f(1)+f(2)+f(1/2)+f(3)+f(1/3)+f(4)+f(1/4)=1/2+1+1+1=3.5
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