把f(x)写成分段函数的形式f(x)=1+x^2,x＞0f(x)=0,x=0f(x)=-(1+x^2),x＜0当x＞0时,令y=f(x)=1+x^2得x=√(y-1),y＞1当x＜0时,令y=f(x)=-(1+x^2)得x=-√(-y-1),y＜-1记f(-1)(x)为f(x)的反函数则f(-1)(x)=√(x-1),x＞1f(...