y=(x^2-1)/(x^2+1)用分离常数法求值域

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y=(x^2-1)/(x^2+1)用分离常数法求值域y=(x^2-1)/(x^2+1)用分离常数法求值域y=(x^2-1)/(x^2+1)用分离常数法求值域y=(x^2+1-2)/(x^2+1)=1-

y=(x^2-1)/(x^2+1)用分离常数法求值域
y=(x^2-1)/(x^2+1)用分离常数法求值域

y=(x^2-1)/(x^2+1)用分离常数法求值域
y=(x^2+1-2)/(x^2+1)=1-2/(x^2+1)
x^2+1>=1
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