新高考數(shù)學(xué)二輪復(fù)習(xí)易錯點01 集合的概念及運算（原卷版）

易錯點01集合的概念及運算易錯題【01】對集合中元素的類型理解不到位集合問題是高考必考問題,一般作為容易題出現(xiàn),求解集合問題的關(guān)鍵是理解集合中元素的類型,特別是用描述法表示集合,首先要搞清楚集合中代表元素的含義,再看元素的限制條件,明白集合的類型,是連續(xù)數(shù)集、離散數(shù)集、點集或其他類型的集合.易錯題【02】忽略集合中元素互異性利用元素與集合的關(guān)系或兩集合之間的關(guān)系求參數(shù)的值,集合中元素的互異性常常容易忽略,求解問題時要特別注意,求出以后一定要代入檢驗,看看是否滿足元素的互異性.易錯題【03】忽略空集空集是任何集合的子集,在涉及集合關(guān)系,如根據(jù)SKIPIF1<0求參數(shù)的值或范圍要注意SKIPIF1<0是否可以為SKIPIF1<0,根據(jù)SKIPIF1<0求參數(shù)的值或范圍必須優(yōu)先考慮空集的情況,否則會造成漏解．易錯題【04】忽視集合轉(zhuǎn)化的等價性把用描述法表示的集合轉(zhuǎn)化為用列舉法表述的集合或化簡集合容易忽略等價性,如去分母忽略分母不為零,解含有對數(shù)式的不等式要保證對數(shù)式有意義,要注意集合中的限制條件等. 01(2021年全國統(tǒng)一高考數(shù)學(xué)試卷乙卷理科)已知集合SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0SKIPIF1<0A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<01.已知集合SKIPIF1<0,則SKIPIF1<0()A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0D．SKIPIF1<02．【2017全國卷3理數(shù)】已知集合A=SKIPIF1<0,B=SKIPIF1<0,則ASKIPIF1<0B中元素的個數(shù)為A．3 B．2 C．1 D．0 02已知集合A＝{1,x,2},B＝{1,x2},若A∪B＝A,則x的不同取值個數(shù)為()A．1 B．2 C．3 D．41．(2022屆貴州省安順市高三第一次測試)已知集合SKIPIF1<0,SKIPIF1<0,若SKIPIF1<0,則SKIPIF1<0()A．1 B．0或1或3 C．0或3 D．1或32.(2022屆江蘇省高郵市高三10月調(diào)研)已知集合SKIPIF1<0,1,2,3,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0中所含元素的個數(shù)為()A．5 B．6 C．10 D．15 03已知A＝{x∈R|2a≤x≤a＋3}A＝{x∈R|x<－1或x>4},若SKIPIF1<0,則實數(shù)a的取值范圍是________．1．已知集合A＝{x|x2＋(p＋2)x＋1＝0,p∈R},SKIPIF1<0,若A∩B＝?,則實數(shù)p的取值范圍為____________．2.設(shè)集合SKIPIF1<0,集合SKIPIF1<0,且SKIPIF1<0,則實數(shù)a的取值范圍是()A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<0 04【2019全國卷3理數(shù)3】已知集合SKIPIF1<0,則SKIPIF1<0()A．SKIPIF1<0 B．SKIPIF1<0C．SKIPIF1<0 D．SKIPIF1<01．已知集合SKIPIF1<0,則SKIPIF1<0()A．SKIPIF1<0或SKIPIF1<0 B．SKIPIF1<0或SKIPIF1<0C．SKIPIF1<0 D．SKIPIF1<02．設(shè)全集SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0()A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0錯1．(2022屆山西省呂梁市高三上學(xué)期11月測試)已知集合SKIPIF1<0,集合SKIPIF1<0,則SKIPIF1<0()A．A B．B C．N D．SKIPIF1<02．(2022屆江西省贛州市2022屆高三上學(xué)期期中)已知SKIPIF1<0、SKIPIF1<0,若SKIPIF1<0,則SKIPIF1<0的值為()A．SKIPIF1<0 B．0 C．SKIPIF1<0 D．SKIPIF1<0或SKIPIF1<03．(2021屆重慶市西南大學(xué)附屬中學(xué)高三下學(xué)期月考)設(shè)集合SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0()A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<04．(2022屆湖北省新高考9N聯(lián)盟部分重點中學(xué)高三上學(xué)期11月聯(lián)考)集合SKIPIF1<0,SKIPIF1<0,則A,B間的關(guān)系是()A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<05．(2022屆四川省資陽市高三第一次診斷)已知集合SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0()A．SKIPIF1<0 B．SKIPIF1<0C．SKIPIF1<0 D．SKIPIF1<06．(2022屆北京市第十三中學(xué)高三上學(xué)期期中)已知SKIPIF1<0,SKIPIF1<0,則集合SKIPIF1<0()A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<07．(2022屆河南省湘豫名校聯(lián)盟高三上學(xué)期11月聯(lián)考)已知集合SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0()A．SKIPIF1<0 B．SKIPIF1<0C．SKIPIF1<0 D．SKIPIF1<08．(2022屆湖北省鄂東南省級示范高中教育教學(xué)改革聯(lián)盟學(xué)校高三上學(xué)期期中聯(lián)考)設(shè)集合SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0()A．SKIPIF1<0 B．SKIPIF1<0C．SKIPIF1<0 D．SKIPIF1<09．(2022屆河南省部分名校高三上學(xué)期10月質(zhì)量檢測)已知集合SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0()A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<