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竞赛求最值，x²+y²=8，求x+y的最大值
初中数学竞赛真题52/425
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App05:20![竞赛解方程：x [x] = 999，这该怎么解？](http://p3-sign.bdxiguaimg.com/tos-cn-i-0026/66461990984b4b4885674459e17d3a89~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=20241225160711B06626C8C85E2FB6454F&requestFrom=704&version_code=80402&x-expires=1766650031&x-signature=3lPdxlOYzB%2FTPut38gLkvtZwnIU%3D)
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