1.f(x)=(2x^2-2x+1)/(x-1)
化简:
f(x)=2x+[1/(x-1)]=2x+[1/(x-1)]-2+2=2(x-1)+[1/(x-1)]+2
2(x-1)+[1/(x-1)]>=2sqrt(2)
so
f(x)>=2sqrt(2)+2
2.f(x)=(4x+1)/(x^2+x+1)
f(x)=4x/(x^2+x+1) +1/(x^2+x+1)
=4/(x+1+1/x)+1/[(x+0.5)^2+0.75]
1.f(x)=(2x^2-2x+1)/(x-1)
化简:
f(x)=2x+[1/(x-1)]=2x+[1/(x-1)]-2+2=2(x-1)+[1/(x-1)]+2
2(x-1)+[1/(x-1)]>=2sqrt(2)
so
f(x)>=2sqrt(2)+2
2.f(x)=(4x+1)/(x^2+x+1)
f(x)=4x/(x^2+x+1) +1/(x^2+x+1)
=4/(x+1+1/x)+1/[(x+0.5)^2+0.75]