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小升初奥数：乙40分钟追上丙，甲50分钟追上乙，求甲追丙的时间？
小升初奥数32/77
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App06:42![小升初奥数： 比较特殊的裂差计算[分母是完全平方数]](http://p26-sign.bdxiguaimg.com/tos-cn-i-0026/aa3a45fa9d0843f4b88a64e6b8e51976~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=20250313075403542B5550BFAC641910FA&requestFrom=704&version_code=80402&x-expires=1773359644&x-signature=SzvZhCoZ7l1g6lkeLcnyt8yKk7Q%3D)
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