2019—2022英语周报高考fjm第二期答案

18.解:(1)∑xy=1×55+2×68+3×80+4×92+5×100=1299x=3,55+68+80+92+100395分5x=1+4+9+16+25=551299-5×3×79114=1142分55-5×3a=79-114×3=44.83分y=114x+448…“……当x=6时,114×6+448=113.2,即预测2020年一年内该乡镇约有113贫困户脱贫……5分∴预测6年内该乡镇脱贫总户数有55+68+80+92+100+113=508>500即预测到2020年底该乡镇500户贫困户能全部脱贫…6分(2)由题意可得:按分层抽样抽取的5户脱贫户中有1户五保户a,1户低保户b,3户扶贫户c,d、e7分从这5户中选2户,共有10种情况:(a,b),(a,c),(a,d)a,e)、(b)、(d),(b,e),(c,d),(c,e),(d,e)………9分记2户不都是扶贫户为事件A,则事件A共有3种情况:(c,d)(c,e,(d,e)11分101010g高考倒计时求抽取的2户不都是扶尺的概学………12分10

应用文写作( One possible versionDear FrankWe plan to participate in the weeklong labor practice in the school field base scheduled from August Ito 8. Im writing to invite you to Join usThe base offers free accommodations and various activities. Participants can learn to do outdoor worklike farming or gardening. The art of making tea, which interests you very much, is also taught. Whatattracts me most is that we'll learn to raise animals such as goats or rabbitsIn the practice, we can experience the value of labor and expose ourselves to a wide range of practicalskills, which will surely benefit usLooking forward to your replyYoursLiH

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