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f(x)=(x^2+x+1)/(x^2+1) 令=(x^2+x+1)/(x^2+1)=t x^2+x+1= t(x^2+1) (t-1)x^2-x+(t-1)=0 判別式=(-1)^2-4(t-1)^2≥0 (t-1)^2≤1/4 -1/2≤t-1≤1/2 1/2≤t≤3/2 值域【1/2,3/2】
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