1
函数f(x)的定义域为R,对于任意实数m,n总有f(m+n)=f(m)*f(n),且x>0时, 0<f(x)<1
f(2m)=f(m)^2
f(3m)=f(m)^3
f(2m)=f(3m-m)=f(3m)*f(-m)
f(-m)=f(2m)/f(3m)=1/f(m)
f(m)f(-m)=1
f(0)=f(m-m)=f(m)f(-m)=1
2
x>0时,0<f(x)<1
对任意x1,x2,且x1>x2时
x1-x2>0,f(x1-x2)<1
f(x1)=f(x1-x2)f(x2)
f(x1-x2)=f(x1)/f(x2)
f(x1)/f(x2)<1
f(x1)<f(x2)
f(x)单调递减
3
设A={(x,y)| f(x^2)*f(y^2)>f(1)}, B={(x,y)| f(ax-y+2)=1},
f(0)=1
B={(x,y)| f(ax-y+2)=f(0)},
ax-y+2=0
y=ax+2,y^2=a^2x^2+4ax+4
f(x^2)*f(y^2)=f(x^2+a^2x^2+4ax+4>f(1)},
x^2+a^2x^2+4ax+4<1
(a^2+1)x^2+4ax+3<0
若A∩B=φ,方程无解
判别式
16a^2-12a^2-12<0
a^2<12
|a|<2√3
-2√3<a<2√3
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