有关极限函数连续函数的练习题,跪求详细解答——————Orz~!Let f(x) be a non-zero function with domain R which satisfies f(x+y)=f(x)f(y) for all x,y. Show that it is continuous everywhere if it is continuous at 0.还是不懂

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有关极限函数连续函数的练习题,跪求详细解答——————Orz~!Let f(x) be a non-zero function with domain R which satisfies f(x+y)=f(x)f(y) for all x,y. Show that it is continuous everywhere if it is continuous at 0.还是不懂
有关极限函数连续函数的练习题,跪求详细解答——————Orz~!
Let f(x) be a non-zero function with domain R which satisfies f(x+y)=f(x)f(y) for all x,y. Show that it is continuous everywhere if it is continuous at 0.
还是不懂。。。。倒数第三步跟倒数第二步之间跳跃蛮大的。。。。继续求详解,。。。。。。。TAT。。。。。。白当理科生了。。。。。。

有关极限函数连续函数的练习题,跪求详细解答——————Orz~!Let f(x) be a non-zero function with domain R which satisfies f(x+y)=f(x)f(y) for all x,y. Show that it is continuous everywhere if it is continuous at 0.还是不懂
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