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}ĿijWУwndȤСM_OwnĿA BƹCë D@򣬞˽WϲgһNĿSCȡ˲֌WM{飬{YLƳ˃ɷĽyӋDՈشІ}

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2ӋClȻaȫyӋD

3Dչʾ12NȿܵĽYҳǡxм҃λͬWĽYȻʹʽ⣮

ԇ}⣺120=200@α{ČW200ˣνyӋDDĈAĽǵĶȔ=360=72

ʴ𰸞飺20072

2C˔200802040=60ˣlνyӋD飺

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ĿДW Դ

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ĿДW Դ

}ĿD֪y=2xͷĈDcAm2

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ĿДW Դ

}ĿDOֱABһcAOC=50ODƽ֡AOCDOE=90㣮

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ĿДW Դ

}Ŀƽֱϵֱl1cSABcֱl20cScCD.

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ĿДW Դ

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ĿДW Դ

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ĿДW Դ

}ĿDֱABCDУADBCABBC, AD=3,CDDrD90DEBAECE,AEDe6tBCL_____

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