定义集合间的差运算：A-B=x|x∈A且x?B．若集合A=3，4，5，6，7，8，9，B=5，7，9，11，13，则A-B= 学习有什么用?
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∵A-B={x|x∈A且x?B}．A={3，4，5，6，7，8，9，}，B={5，7，9，11，13，}，则A-B={3，4，6，8}．
故答案为 {3，4，6，8}．
绛旓細鍥犱负 a^2-4a+5=(a-2)^2+1>=1 锛屽洜姝 A=锝泋 | x>=1锝濓紝鎵浠ョ敱瀹氫箟锛A-B=锝泋 | 1<=x<m锝濓紝鐢变簬 A-B 鈮 桅 锛屽洜姝 m>1 銆
绛旓細鍥犱负x涓嶅睘浜嶣锛屾墍浠A-B=锝泋<=-1/2鎴杧>=2锝濓紝鍙堝洜涓哄睘浜嶢锛屾墍浠ュ彇浜ら泦锛屽緱a>=2
绛旓細(1) A-B=A鈭(cuB锛 B-A=B鈭(cuA)2锛夎A={0锛1锛2锛3}锛孊={1锛2锛4}锛孉-B={0,3}, B-A={4}.宸茬煡A={x|x>4},B={x||x|<6},锛1锛堿-B={x|x銆6}锛 A-(A-B)={x|4<x<6} B-A={x|-6<x銆4}锛 B-(B-A)={x|4<x<6}锛岃孉鈭〣={x|4<x<6...
绛旓細瑙ｇ瓟锛氬畾涔堿涓嶣宸泦涓A-B={x|x鈭圓锛屼笖x∉B} 鍒橝-B琛ㄧずA鈭〤uB 鈭 A-锛圓-B锛=A鈭〣 A,B鏈夋棤浜ら泦锛堝簲璇ヨ鏄┖闆嗚繕鏄潪绌猴級涓嶅奖鍝嶆渶鍚庣殑缁撴灉銆
绛旓細鐢瀹氫箟 A-B = A 鈭 锛圕RB锛 鍗矨骞朵笂B鐨勮ˉ闆 渚嬪 A = {1 , 2} ,B = {1} 鍒 A-B = 锝2锝
绛旓細1.a={5 6 8},b={5} 2.浠栦滑鐨勫樊闆嗭紝涓嶄竴瀹氱浉绛夛紝鍥犱负b-a鏄┖闆 3.a-(a-b)鏄┖闆嗭紝b-(b-a)={4<x<5} 闆嗙殑杩愮畻涓嶈兘浜掓崲
绛旓細瑙ｏ細锛1锛堿={1,2,3}锛孊={2,4} A-B={1,3}锛孊-A={4} 锛2锛変笉鐩哥瓑锛屼笂闈㈢殑渚嬪瓙鍗冲彲 锛3锛夊疄闄呬笂A-B=A鈭〣鐨勮ˉ闆 鎵浠 A-(A-B)=A鈭〣锛屽悓鏍稡-(B-A)=A鈭〣 鎵浠 A-(A-B)=B-(B-A)={x|4<x<6}
绛旓細瀵逛簬闆嗗悎A,B,鎴戜滑鎶婇泦鍚坽x|x鈭圓涓xB}鍙仛闆嗗悎A涓嶣鐨勫樊闆,璁板仛A-B,鑻A-B=,鍒欓泦鍚圓涓嶣涔嬮棿鐨鍏崇郴鏄()銆... 瀵逛簬闆嗗悎A,B,鎴戜滑鎶婇泦鍚坽x|x鈭圓涓攛 B}鍙仛闆嗗悎A涓嶣鐨勫樊闆,璁板仛A-B,鑻-B= ,鍒欓泦鍚圓涓嶣涔嬮棿鐨勫叧绯绘槸( )銆 灞曞紑
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绛旓細闆嗗悎鏄暟瀛︿腑涓涓熀鏈笖閲嶈鐨勬蹇碉紝瀹冩槸鎴戜滑鐮旂┒闆嗗悎璁恒佹嫇鎵戙佸疄鏁扮悊璁哄拰璁稿鍏朵粬鏁板鍒嗘敮鐨勫熀纭銆闆嗗悎闂寸殑杩愮畻鍖呮嫭浜ら泦銆佸苟闆嗐佽ˉ闆嗐佸樊闆嗙瓑銆傝繖浜涜繍绠楁槸鍩轰簬闆嗗悎鐨勪氦銆佸苟銆佽ˉ銆佸樊绛夋蹇佃繘琛屾搷浣滅殑銆備竴銆佷氦闆嗭紙Intersection锛変氦闆嗘槸鎸囦袱涓垨澶氫釜闆嗗悎鐨勫叕鍏卞厓绱犵粍鎴愮殑闆嗗悎銆傜粰瀹氫袱涓闆嗗悎A鍜B锛屽畠浠殑浜ら泦...
