【文档说明】东北三省三校(哈师大附中)2021届高三第三次模拟考试 数学(文)答案.pdf,共(5)页,168.424 KB,由小赞的店铺上传
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题号123456789101112答案BACBBAADABAA13-16填空题113<14811516123e(一)必考题:共60分.221331331317.sincossincossinsincossincoscos222244
44311cos2sinsin24442352k22,k,,6232121213fsin2,si234fxxxxxxxxxxxxxxxkkkZAA
LL分单调增区间为分222223n2,0,83223113sin3,4922242cos12,4103b44,440,2,212ABCAAASbcAbcbcabcbcbcbcbbbbc
LLLL分分分分22222218.2,2,2,2,1,,2,5,61132,1=2122222DACEEACDACDACEABCACABBCCACDADACDADACCDACCDPAABCDCD
ABCDPACDPAACACDPACPCPCACDPCVVEACDSSLLILL中,,中,分平面平面,分平面分平面分设D到平面ACE距离为h到平面距离为,,3943411,11434123hhDAC
ELLL分分到平面的距离为分19.党的十八大以来,习总书记在不同场合多次强调要“厉行节约,反对浪费”,要加大宣传引导力度,大力弘扬中华民族勤俭节约的优秀传统.某自助餐厅为响应号召,通过对就餐人员用餐后的剩余食物情况进行调查后并采取适当的奖惩
政策.(1)现有5人用餐,互相之间都不认识.若这5人中有3男2女,从这5人中任取2人,恰有一男一女的概率;(2)若每人每次用餐需68元,用餐后若无剩余食物,则返回5元奖励;若剩余在0克50克,则不奖不罚;
若剩余在50克100克,则罚10元;若剩余在100克以上,则罚20元.近期调查200位来就餐人员,统计结果如下表:食物剩余量(克)无剩余0,5050,100100克以上人数1801262求某人来就餐消费的总费用的平均值.12312121311122321223132
12111221223132322103563==710538518063+1268+6AAAABBAAAAABABAAABABABABBBABABABABABABLLLLL19.设有一男一女为事件,1分男为,,,女为,
,任取人共有,,,,,,,,,种取法,分其中满足条件的取法有,,,,,共6种取法分PA分恰有一男一女的取法的概率为分平均值为x78+288=6411200LL分消费的平均值为64元12分
22minmax2211120.,1,01e2110,1,05e1g00g0700,g0,,g0,g0,,11+a00,,xfxxfxxxxfeeaxaxxxxaaxaxaxaaaa
,是增函数,分f最大值为最小值为分x时,x,0,+为增区间分时,xx在是减函数,是增函数分综上所述a0时,0,是增区间时,是减区间,是增区LLLL间12分L22222212
22221221321.,,242215433535135135944-611242420222212,344120,,,34124,34ADBDcbaaxyABkkykxkxkxkyBxyxykxxk
QLLL1a,b=3分椭圆方程为分直线斜率不存在时,,,,D-2,0分,设Ax24222122212121212121222222222212,164341243645073411249222412213434491112
42024343491220ADBDADBDkxxkkkkkkxxxxyykkxxxxxxkkkkkkkkkkkLLLL分分分的值为分(二
)选考题:共10分.请考生在第22、23题中任选一题作答.如果多做,则按所做得第一题计分.222222222221212xcos22.,3cos4sin12,3412,:12sin43221+=1222
2+41+=1242802282167,,42481440772xyxyCyxyttttttttttQLLL分直线的普通方程为x+y=14分7把直线参数方程与椭圆联立3,21
64242,927742107MtttPMPMLL分分的长为分2222213323.,21224,,124411,12224,22551,12224,,-34453--5441212221223,121
23123,xxxxxxxxxxxxxxxxxxbcabcLLLULL22分无解分分原不等式解集为,,+分时等式成立,m=36分aa229914a369,,,1231
41414bcbcabcLL分当且仅当即时,等号成立10分