安徽省合肥市2024-2025上学期七年级月考模拟卷(二)试题(数学)

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安徽省合肥市2024-2025上学期七年级月考模拟卷(二)试题(数学)试卷答案

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综合能力评估试题(8)参考答案及部分解析参考答案1-5BAABC6-10ABBCB11-15BCACA16-20CACAB21-25ADDAD26-30DBCCB31-35AABCD36-40ACDGB41-45CBADB46-50BCDCA51-55DBCDA56.who57.widely58.giving59.as60.of61.towalk62.comments63.kindness64.their65.valuable写作第一节Onepossibleversion:DearPeter,I'msorrytohearthatyouhadanargumentwithyourclassmateintheDramaClubwhendiscussingyourrehearsaltime.Itisverycommontoreceivedifferentopinionsfromothers,especiallyyourclassmatesandpartners.Asyourfriend,Iadviseyoutobeagoodlistenerfirstwhenyoutwoholddifferentviews.Thenwhenyoucalmdown,haveagoodconversationwithyourclassmateandtellhimorheryourthoughtsontherehearsaltimepatiently.Ihopemysuggestionscouldprovidebothofyouwiththehelpyouneed.Yours,LiHua第二节Onepossibleversion:About5minuteslater,oneofmyclassmatescameuptomeandhandedmemydiary.SheexplainedthatIhadleftitundermytableinclassandAliceuncoveredmysecretbyaccident.IfeltsoguiltyinmyheartasIthankedtheclassmate.Irealisedmymisunderstanding.AsenseofdeepandbitterregretcrashedovermeasithoughtaboutLynn'ssadfacewhenIshoutedthoserudewordsather.GuiltwashurtingmyinsidesasIhurriedbacktothefieldinsearchofLynn.Luckily,Lynnwasstillinthefield.Shelookedverysad."Lynn?"IsaidsoftlyasIgotclosetoher."I'msosorry!Pleasestopbeingangrywithme!"Iwentontoexplaintoherandthankfully,Lynnsmiled.Shesaid,"It'sokay.Iwon'tbemadatyou."AsLynnandIhuggedeachotherwarmly,IrealisedhowafriendshipcouldeasilybebrokenandIpromisedtoloveandtrustLynnforever【补充说明】1.apainintheneck讨厌的家伙2.stormv.气呼呼地疾走,冲部分解析阅读第一节

分析由圆的参数方程得P(2+2cosθ,3+2sinθ),0≤θ≤2π.设Q(x,y),由已知得(x-4,y)=($\frac{2cosθ-2}{3}$,$\frac{3+2sinθ}{3}$),由此能求出动点Q的轨迹.

解答解:∵点P为圆C:(x-2)2+(y-3)2=4上一动点,
∴P(2+2cosθ,3+2sinθ),0≤θ≤2π.
设Q(x,y),∵A(4,0),$\overrightarrow{AQ}$=$\frac{1}{3}$$\overrightarrow{AP}$,
∴(x-4,y)=$\frac{1}{3}$(2cosθ-2,3+2sinθ)=($\frac{2cosθ-2}{3}$,$\frac{3+2sinθ}{3}$),
∴$\left\{\begin{array}{l}{x-4=\frac{2cosθ-2}{3}}\\{y=\frac{3+2sinθ}{3}}\end{array}\right.$,∴$\left\{\begin{array}{l}{2cosθ=3x-10}\\{2sinθ=3y-3}\end{array}\right.$.∴$\left\{\begin{array}{l}{\frac{2}{3}cosθ=x-\frac{10}{3}}\\{\frac{2}{3}sinθ=y-1}\end{array}\right.$,
∴(x-$\frac{10}{3}$)2+(y-1)2=$\frac{4}{9}$.
∴动点Q的轨迹是以($\frac{10}{3}$,1)为圆心、以$\frac{2}{3}$为半径的圆,其方程为(x-$\frac{10}{3}$)2+(y-1)2=$\frac{4}{9}$.

点评本题考查动点的轨迹方程的求法,是中档题,解题时要认真审题,注意圆的参数方程、向量知识、圆的性质、三角函数等知识点的合理运用.