Find the derived set of each of the following sets:
1. {2^(-n) + 5^(-m) | m,n is N}
2. {(-1)^n + 1/m | m,n is N}
3. {1/n + 1/m | m,n is N}
4. {(-1)^n / (1+ 1/n) | n is N}
我的解
1.[0,7/10] 2.[1,3/2]∩[-1/2,-1] 3.[0,3/2] 4.[2/3,1]∩[-1,-1/2]
我算的答案跟助教算的不太一樣
有高手可以指點一下嗎@@ 我哪裡錯了
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