2023-2024学年吉林省高二试卷12月联考(24-184B)数学.考卷答案

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2023-2024学年吉林省高二试卷12月联考(24-184B)数学.考卷答案试卷答案

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BMytwinsisterAliceandIhavebeentryingtogetpeopletostopdroppingcigarettebutts(forsevenyears.Oneday,wewerewalkinginourhometownandsawhundredsofcigarettebuttsontheground.Theymadethetownlooksouglythatwedecidedtostartagrouptomakepeoplestopdroppingbutts.Wecalledit“NoButtsAboutIt”.Atfirst,wedrewpictureswith"TheEarthisnotyourash-tray(烟灰缸)”writtenonthem.Weputthepicturesaroundourhometown-inparks,bybeaches,andalongroads.Wewantedtomakepeopleunderstandthatdroppingbuttshurtstheenviron-ment.Mostsmokersdon'tthinkthatdroppingbuttshurtstheEarth.Butitdoes,andallrubbishdoes!Later,wewrotetocompaniesandaskedthemformoneyto

分析两圆方程相减,可得公共弦的方程,利用勾股定理,即可求公共弦AB的长.

解答解:由题意相交弦AB所在的直线方程为:[(x+4)2+(y+3)2-8]-[x2+y2-9]=0,即4x+3y+13=0,
因为圆心(0,0)到直线4x+3y+13=0的距离为$\frac{13}{5}$,所以|AB|=2$\sqrt{9-\frac{169}{25}}$=$\frac{4\sqrt{14}}{5}$.
故答案为:$\frac{4\sqrt{14}}{5}$.

点评本题考查两圆的位置关系,考查弦长的计算,确定公共弦的方程是关键.