设f(x)是定义在R上的函数,且对于任意x,y∈R,恒有f(x+y)=f(x)f(y),且当x>0时,f(x)>1.证明:(1)当f(0)=1
(1)当f(0)=1,且x
人气:347 ℃ 时间:2019-10-11 16:43:42
解答
f(x+y) = f(x)f(y)for x f(x) ( -x > 0,=> f(-x)>1 )put y=xf(2x) = {f(x)}^2 > 0ie f(2x) >0 for all xf(x) > 0 for all xx => y = x+a (a>0)=> f(y) = f(x+a)= f(x)f(a)> f(x) (f(a) > 1 )f is increasing
推荐
- 设f (x )定义在R上的函数,且对任意x,y∈R,恒有f(x+y)=f(x)f(y),且x>0时,f(x)>1证明:
- 设定义在R上的函数f(x),对任意x,y∈R,有f(x+y)=f(x)*f(y),且当x>0时,恒有f(x)>1.证明:
- 设f(x)是定义在R上的函数且对任意x,y属于R,恒有f(x+y)=f(x)f(y),且x>0时,0
- 设f(x)是定义在R上的函数,且对于任意x.y∈R恒有f(x+y)=f(x)f(y),且x>0时,f(x)>1.证明
- 设f(x)是定义在R上的函数且对任意x,y属于R,恒有f(x+y)=f(x)f(y),且x>0时,f(x)>1证明
- 英语翻译:50米高的大楼:是50-metre-high building 还是 50-metre high building
- we are in no position to dictate any terms to the world .
- 我们有各种颜色的毛衣!用英语怎么说?
猜你喜欢