[求助JJ14X

dowadilidili

141.    s t positive integers >1, are factors of n. Are the following factors of n^st  ?

1. s^t
            

2. (s^t)²
            

3.(s+t)
        

我算出來只有第一個符合!有人可以幫我解釋一下為啥會1+2都OK嗎?