2023年高考数学求定义域专题练习（附答案）.doc

第1页共3页2023年高考数学求定义域专题练习附答案一单选题1函数119891119909119909111199092的定义域为A1B1C122D1222函数1198911199091lg21199091的定义域为A11990911990912B11990911990912且1199091C11990911990912且1199091D119909119909123函数fx11990911199092的定义域为A122B1C12D14函数119891119909119909120119909211199092的定义域为A212B2C21212D125若集合119860119910119910cos119909119909119877119861119909119910ln119909则119860119861A11B0C01D6函数119891119909lg11990911119909的定义域是A11B11C1D17若函数11989111990911990941199095的定义域为集合119860则119860A4B5C45D4558函数119891119909119909111199092的定义域是A1B122C1D122第2页共3页9已知函数119910119891119909的定义域为04则函数1199101198912119909ln1199091的定义域为A12B12C18D1810函数119891119909119909311989711990011989226119909的定义域是A1199091199096B1199093C1199091199093D119909311990911已知集合Axlog2x1Bx0xc其中c0若ABB则c的取值范围是A01B1C02D212函数1198911199091199091199091119897119899119909的定义域为A119909119909C1199091199091D119909119909113函数1198911199091119909lg31199091的定义域为A131B01C13D01314函数y241199092的定义域为A22B22C22D2215已知函数119891119909log21199092119909则1198911199092的定义域为A11B01C11D01二填空题16函数119891119909119909211199091的定义域是17函数119891119909211990911199091定义域为18函数ylog2x131199092的定义域是19函数fx11199091的定义域为20函数ylg3x2x1的定义域为21函数11989111990911990941199095的定义域是22设函数11989111990911990921的定义域是119860119877为全体实数集则11986211987711986023关于函数11989111990941199091199092有如下四个命题第3页共3页的定义域为0119891119909的最小值为1119891119909存在单调递减区间1205720119891sin1205720其中所有真命题的序号是24函数ylog22sin2x321199092的定义域为答案D2C3A4C5C6A7D8B9B10D11D12C13A14A15A16211171218231119120032145522119909123242362