#1
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¶éÒ A ={5,6,7,...,20} áÅÐ B = {1,2,3,...,15} áÅéǨӹǹÊÁÒªÔ¡ã¹à«µ {x$\left|\,\right. $x à»ç¹ÊѺ૵¢Í§ A áÅÐ x äÁèà»ç¹ÊѺ૵¢Í§ B} à·èҡѺ¢éÍã´
1. 7x2^10 2. 31x2^11 3. 31x2^10 4. 63x2^11 ú¡Ç¹ªèÇÂá¹Ð¹Ó´éǤÃѺ |
#2
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¢é͹Õéà»ç¹¢éÍÊͺàÍç¹ ÁÕ.¤. 42 ¤ÃѺ!!!
Íѹ´Ñºáá¡çËÒ૵ ¢Í§ A-B ={....} ¨Ò¡¹Ñ鹡çËÒ «Ñºà«µ ÍÂèÒÅ×Á -1 ¹Ðà¾ÃÒÐ૵ÇèÒ§àÃÒäÁèãªé à¹×èͧ¨Ò¡àÃÒ¨ÐàÅ×Í¡ÊÁÒªÔ¡·Õè¶Ù¡àÍÒÍ͡仢ͧ૵¨Ò¡à«µ A à¢éÒÁÒÍÂÙèã¹à«µ ·ÕÅÐ 1µÑÇ 2 µÑÇ 3µÑÇ ä»àÃ×èÍÂ樹¤Ãº ¶éÒàÃÒ¤×Í૵ÇèÒ§æ «Ñºà«µµÑǹÑ鹡ç¨Ðà»ç¹«Ñºà«µ¢Í§µÑÇ B ·Ñ¹·Õ !! Åͧ·Ó´Ù¹Ð¤ÃѺ ¶éÒ·ÓäÁè¼Ô´¼Á¤Ô´ÇèÒ¹èҨеͺ¢éÍ 2 ¤ÃѺ ^^
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µéͧà¢éÒã¨ãËéä´é äÁèÁÕã¤ÃÅÔ¢ÔµµÑÇàÃÒ ¹Í¡¨Ò¡µÑÇàÃÒ àÃÒà»ç¹¤¹àÅ×Í¡àͧ¤Ñº |
#3
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¨Ó¹Ç¹ÊѺ૵¢Í§ $A = 2^{16}$
¨Ó¹Ç¹ÊѺ૵¢Í§ $A \cap B = 2^{11}$ ¨Ó¹Ç¹ÊѺ૵¢Í§ A ·ÕèäÁèà»ç¹ÊѺ૵¢Í§ B = $2^{16} - 2^{11} = 2^5 x 2^{11} - 2^{11} = 31 x 2^{11}$ |
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