ʱ : 2019-2020学年北京市丰台区中考数学二模试?有标准答? - 百度文库ϿʼĶ
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һѡ⣨30֣ÿС3֣иĸѡֻһǷģ
1ֹ2015ףҹʵ31ʡ־Ը֯ȫǣ־Ըѳ110 000 000ˣ110 000 000ÿѧʾӦΪ A110106
B11107 C1.1108
D0.11108
2ͼABCDĸ㣬бʾֵȵʵĵǣ
AAD BB D CBC DCD
3һöʵؾȵӣϷֱ123456֣öһΣϵִ4ĸǣ A B C D
4ҹĹ⣬ǽܡйͳĻҪý飮ĸУԳͼεǣ
A B C D
5һǰ尴ͼзʽţǦڣ
A30 B45 C60 D75
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A10m B10m C15m D5m
7סҡ˽ԣÿ10ƽɼǡö9.6ֱ
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S2=0.96S2=1.12S2=0.56S2=1.58ڱУɼȶǣ
A B C D
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Aȷһֱ B֮߶ C߶
Dͬһƽڣһֻһֱֱ֪ߴֱ
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A5Ԫ B10Ԫ C12.5Ԫ D15Ԫ
10һ۲ԱҪͼ1ʾABCDĸ۲й۲⣬н·ͬһƽϵABBCCDDAACBDɣΪ¼۲Աн·ߣABеMһ̨λ۲Աн·Ϊx۲Ա붨λ֮ľΪy۲Աнұʾyxĺϵͼͼ2ʾ۲Աн·߿Ϊ
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⣨18֣ÿС3֣ 11ֽʽx34x2+4x=
12֪OMOΪԲģⳤΪ뾶OMڵAԵAΪԲģ
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AOΪ뾶ڵBOBͼʾAOB= ȣ
13xIJʽaxbĽ⼯Ϊx1дһʵabֵa= b=
14ҹѧҳ̴λֱָ㷨ͳڡһ⣺ һͷһɮɮ Сɮ˷һСи
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÷꣮һ˷3С3˷һʴСимˣxˣСyˣзΪ
1520102015ͳͼʾͳͼṩϢԤ2016걱лıԼ Ԥ
16ͼнֱϵxOyAOBλ÷ֱǣ1100ͣ10λһCʹAOBCĿӳΪһԳͼΣдCλõ꣺
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⣨72֣17-26⣬ÿС5֣277֣287֣298֣ 17㣺
18֪4x=3yʽx2y2xyx+y2y2ֵ 19֪xһԪηx2+3x+1m=0ȵʵ 1mȡֵΧ
2mΪʱ̵ĸ
20ͼABCǵȱΣBDACڵDEΪBCе㣬DE֤DE=DC
212016529գӭˡս100һܡٹ·£̹10010ˡ10ķʽչһܰߣԭÿӼܲλ12ΪμӴ˴λռƻǿѵٶߵԭ1.2ǰ10ӵλԭÿСʱܶٹ 22ͼABCDĶԽ߽O㣬DEACCEBD 1֤ıOCEDǾΣ
2AD=5BD=8tanDCEֵ
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