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  • 亚洲狠 - 天堂网

    亚洲狠 - 天堂网

    前言：答：（1） 设x,y,z为正实数。求证 x^2/(x^2+y^2+xy)+y^2/(y^2+z^2+yz)+z^2/(z^2+x^2+zx)>=1 证明 去分母得: x^2*(y^2+z^2+yz)*(z^2+x^2+zx)+y^2*(z^...

    09-30 5 504 原唱歌曲