jsir520 Just popping in
註冊日: 2008-05-06 發表數: 6
| Re: 證明題 | |
1. x=3, ..... 3=2+1 , ....................... y: 2-1=1 非質數→條件應改為x>3
2. x=4, ..... 4=3+1=2+2 , ................ y: 3-1=2 ,...2-2=0 3. x=5, ..... 5=4+1=3+2 , ................ y: 4-1=3,...3-2=1
4. x=6, ..... 6=5+1=4+2=3+3 , ......... y: 5-1=4,...4-2=2,... 3-3=0 5. x=7, ..... 7=6+1=5+2=4+3 , .......... y: 6-1=5,...5-2=3,...4-3=1 6. x=8, ..... 8=7+1=6+2=5+3=4+4 , ... y: 7-1=6,...6-2=4,...5-3=2,...4-4=0 ............................. 照這樣下去, x未必是質數, y值也只會是全由奇數或全由偶數所組成. 偶數中有質數2,奇數中的質數就更多了 那y當然一定可以是質數
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