高中数学常用公式及常用结论1.元素与集合的关系UxAxCA???,UxCAxA???.2.德摩根公式();()UUUUUUCABCACBCABCACB==IUUI.3.包含关系ABAABB=?=IUEMBEDEquation.DSMT4UUABCBCA????UACB?=FIEMBEDEquation.DSMT4UCABR?=U4.容斥原理()()cardABcardAcardBcardAB=+-UI()()cardABCcardAcardBcardCcardAB=++-UUI()()()()cardABcardBCcardCAcardABC---+IIIII.5.集合12{,,,}naaaL的子集个数共有2n个;真子集有2n–1个;非空子集有2n–1个;非空的真子集有2n–2个.6.二次函数的解析式的三种形式(1)一般式2()(0)fxaxbxca=++?;(2)顶点式2()()(0)fxaxhka=-+?;(3)零点式12()()()(0)fxaxxxxa=--?.7.解连不等式()NfxM