已知函数fx=x^2+2x(x>=0),2x-x^2(x

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已知函数fx=x^2+2x(x>=0),2x-x^2(x已知函数fx=x^2+2x(x>=0),2x-x^2(x已知函数fx=x^2+2x(x>=0),2x-x^2(xf(x)=x^2+2x=(x+1

已知函数fx=x^2+2x(x>=0),2x-x^2(x
已知函数fx=x^2+2x(x>=0),2x-x^2(x

已知函数fx=x^2+2x(x>=0),2x-x^2(x
f(x)=x^2+2x=(x+1)^2-1(x>=0),
开口向上,对称轴x=-1
故f(x)在[0,+∞)是增函数,且f(x)>=0,即有|f(x)|=ax,即有x^2+2x=ax,a=x+2>=2
f(x)=2x-x^2=-(x-1)^2+1(x

a大于等于2