已知f(x)=3^x求证
(1)f(x) X f(y) = f(x+y)
(2)f(x) / f(y) = f(x-y)
怎么做啊。。。。帮帮啦!
已知f(x)=3^x求证
(1)f(x) X f(y) = f(x+y)
(2)f(x) / f(y) = f(x-y)
怎么做啊。。。。帮帮啦!
f(x) X f(y)=3^x3^Y=3^(x+Y)=f(x+y)
f(x) / f(y)= 3^x/3^Y=3^(x-Y)=f(x-y)
看懂了吗?
f(x) X f(y)=3^x3^Y=3^(x+Y)=f(x+y)
f(x) / f(y)= 3^x/3^Y=3^(x-Y)=f(x-y)