1.f(-1)=a-b+1=0,b=a+1且函数f(x)的值域为[0,﹢无穷),显然x=-1为该抛物线的对称轴,且抛物线开口向上,a>0对称轴x=-1=-b/(2a)=-(a+1)/(2a)a=1f(x)=x²+2x+1F(x)=x²+2x+1,x>0=-(x²+2x+1),x0mn0,m>|n|,m²>n²f(x)为偶函数,b=0,f(x)=ax²+1F(m)=f(m)=am²+1F(n)=-f(n)=-an²-1F(m)+F(n)=a(m²-n²)>0