已知f(x)=x²/1+2x²,求f(-1),f(2),f(a).
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已知f(x)=x²/1+2x²,求f(-1),f(2),f(a).
已知f(x)=x²/1+2x²,求f(-1),f(2),f(a).
已知f(x)=x²/1+2x²,求f(-1),f(2),f(a).
f(x)=x²/(1+2x²)
f(-1)=(-1)²/(1+2(-1)²)=1/3
,f(2)=2²/(1+2*2²)=4/9
,f(a)=a²/(1+2a²).