河南省洛阳市洛宁县第一高级中学2017_2018学年高一数学上学期期中试题(PDF).pdf

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1、书书书洛阳市学年第二学期期中考试高一数学试卷参考答案一、选择题 二、填空题 (,)(,)槡,三、解答题解:()由珗犪珗犫,得(),分狓狓 分()分解:()由珗犪(,槡)和珗犪珗犫,设珗犫珗犪(,槡)(,槡),分由珗犫,得(槡)槡, ,分 珗犫珗犪(,槡)或珗犫珗犪(,槡)分()设珗犪与珒犮的夹角为,由(珗犪珒犮)(珗犪珒犮),得(珗犪珒犮)(珗犪珒犮)珗犪珗犪珒犮珒犮分 珗犪,珒犮, 珗犪珒犮分 珗犪珒犮狘珗犪狘狘珒犮狘槡槡,分 珗犪与珒犮的夹角为分解() 珗犪(槡,狓),珗犫(,(狓), 犳(狓)珗犪珗犫槡狓(狓)高一数学答案第页(共页)()槡狓(狓狓槡)槡狓槡(狓)(狓)分犜,即犳(狓)的

2、最小正周期为分令犽狓犽,犽犣犽狓犽, 犳(狓)的单调递增区间为犽,犽(犽犣)分() 狓, 狓,分 (狓),槡分 当狓,即狓时,函数犳(狓)的最大值为槡,分当狓,即狓时,函数犳(狓)的最小值为分解:()犳(狓)狓槡狓(狓)槡狓槡(狓槡狓)槡(狓)分即函数犳(狓)的最大值为槡 犃犅犆为等边三角形, 犅犆边上的高为槡,犅犆,分 函数犳(狓)的最小正周期为, 分()由()可知, 犳(狓)槡(狓),分 槡(狓)槡,高一数学答案第页(共页)()即(狓) 犽狓犽,犽犣分即犽狓犽,分 不等式犳(狓)槡的解集为狓狘犽狓犽,犽犣分解:()设弧长为犾,半径为狉,由题可知犾狉犾狉烅烄烆,解得犾狉,分所以扇形犗犃犅的面

3、积犛犾狉分()连结犗犌并延长交犃犅于犕(如图),则犕是犃犅的中点,由犌是犗犃犅的重心得:犗犌犗犕(犗犃犗犅)(珗犪珗犫),分犘犌犗犌犗犘(珗犪珗犫)犿珗犪(犿)珗犪珗犫犙犌犗犌犗犙(珗犪珗犫)狀珗犫珗犪(狀)珗犫 犘、犌、犙三点共线, 犘犌犙犌,即(犿)珗犪珗犫珗犪(狀)珗犫分 珗犪、珗犫不共线, 由平面向量基本定理得:犿(狀)烅烄烆犿狀犿狀,分 犿狀即犿狀为定值分() 犃犆犗犆犗犃犗犃犗犅犗犃(犗犅犗犃)犃犅,分 犃犆犃犅,又犃犆与犃犅有公共点犃,分 犃、犅、犆三点共线分高一数学答案第页(共页)()() 犗犃(,狓),犗犅(狓,狓),狓, 犗犆犗犃犗犅(,狓)(狓,狓)(狓,狓),故犗犃犗犆狓狓,犃犅槡狓狓,分从而犳(狓)犗犃犗犆(犿)犃犅犿狓狓(犿)狓犿即犳(狓)(犿)狓狓犿狓(犿)狓犿狓(犿)犿犿,分 狓, 狓,当犿,即犿时,当狓时,犳(狓)犿犿犿犿,得犿或犿,又犿,所以犿;分当犿,即犿时,当狓时犳(狓)犿,得犿槡,又犿,所以犿槡分综上所述,犿的值为犿或犿槡分高一数学答案第页(共页)()

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