韦东奕卖书4天后，两套练习册从他的小店消失了。8月22日晚，韦东奕的B站账号页面已经看不到他的小店以及此前上架的两套小学、初中数学解题能力训练练习册。    Nation deepening partnerships through major energy projects in Latin America    As the world's transition toward more sustainable development accelerates, China and Latin America are embracing broader and deeper energy cooperation, leveraging cutting-edge technological innovations to power a green future for the Global South.     From State Grid Corp of China's Belo Monte Ultra High Voltage Direct Current Phase II transmission line in Brazil, to China Three Gorges Corp's comprehensive digital modernization of Brazil's legacy Jupia and Ilha Solteira hydropower stations, and the Cauchari solar project in Argentina, jointly undertaken by Power Construction Corp of China and Shanghai Electric Power Construction Co, China and Latin America are jointly setting new benchmarks for cross-border clean energy integration.    These flagship projects go beyond traditional capital investment, representing a deeper leverage of China's technological standards and management expertise. By upgrading legacy infrastructure, Chinese enterprises are powering Latin America's green transition for more secure regional grid stability.    This strategic momentum is guided by top-level diplomacy and shared visions.    While addressing the opening ceremony of the fourth ministerial meeting of the China-CELAC (Community of Latin American and Caribbean States) Forum last year, President Xi Jinping noted that by adapting to the overriding trend of economic globalization, China and Latin America have continuously deepened pragmatic cooperation in fields including trade, investment and infrastructure construction.    Xi emphasized that both sides should strengthen the alignment of development strategies and advance high-quality Belt and Road cooperation, calling for efforts to deepen cooperation in traditional areas such as energy and minerals, while expanding cooperation in emerging sectors including clean energy.    Such top-level commitment builds on a long-standing strategic alignment. As President Xi pointed out at the China-Latin American and Caribbean Countries Leaders' Meeting in 2014, "China and Latin America are highly complementary in economy and closely aligned in development strategies, granting us natural advantages in strengthening cooperation".    With such a strategic blueprint in sight, top Chinese energy regulators have emphasized the pivotal role of this cross-border synergy.    Ren Jingdong, deputy director of the National Energy Administration, said that energy collaboration is a crucial component of pragmatic cooperation between China and Latin America, achieving remarkable results.    "As China and Latin American countries have actively promoted energy transition and the development of renewables in recent years, new energy cooperation has emerged as a new highlight and a fresh driver for China-Latin America energy synergy," Ren said.    Guided by these high-level consensuses, Chinese enterprises have delivered monumental infrastructure breakthroughs on the ground.    Brazil has grappled for decades with a severe structural challenge. While its northern Amazon basin boasts abundant hydroelectric resources, the vast majority of its industrial and residential power demand is concentrated in the southeast. The 2,534-kilometer Belo Monte Phase II project, independently invested, constructed and operated by State Grid Corp of China under a 30-year concession agreement, bridges this divide. As a vital "green artery", it transmits massive volumes of hydropower directly to metropolitan load centers like Rio de Janeiro.    "The megaproject ensures a highly stable and reliable power supply for Brazil's core economic regions, successfully resolving the nation's developmental bottleneck of spatial energy mismatch," said Ye Xiaoning, a senior engineer at the State Grid Energy Research Institute.    Ye emphasized that the project establishes a global paradigm for cross-regional clean energy transmission, proving the safety, maturity and global applicability of China's ultra-high-voltage grid technologies.    Beyond Brazil, China's clean energy footprint is having a transformative impact across other extreme terrains in South America. In Argentina, the Cauchari solar project stands as one of South America's largest single photovoltaic power stations, and is the world's highest-altitude solar park.    Situated over 4,000 meters above sea level in the Andes Mountains, the 315-megawatt complex features more than 1.2 million solar panels. The landmark installation has ended Jujuy province's long-standing reliance on power transmitted from other provinces, achieving local energy self-sufficiency.    Furthermore, China's unparalleled expertise in hydropower operation has breathed new life into Brazil's legacy energy assets. Through a landmark $3.7 billion transaction establishing a 30-year concession, CTG Brasil officially took over the operation of the Jupia and Ilha Solteira hydropower stations, which feature a combined capacity of nearly 5 million kilowatts and meet the electricity needs of over 6 million people annually.    Rather than merely managing the aging infrastructure, CTG initiated a monumental technical overhaul. By upgrading mechanical equipment that had operated for nearly half a century into fully digital and intelligent monitoring systems across 12 generating units, CTG successfully performed a "heart transplant" on the legacy power hubs.    Industry observers said these milestone projects are just the beginning. As more Latin American nations accelerate their ecological transition, Chinese enterprises are poised to deepen their engagement through localized manufacturing, joint research and green financing under the framework of high-quality Belt and Road cooperation.    As this Sino-Latin American energy synergy continues to unfold, it proves that China's mature grid and generation solutions are essential enablers for emerging economies seeking to decarbonize at affordable costs while maintaining power stability and self-sufficiency, said Ye.    "Together, China and Latin America are actively charting a shared, sustainable course for the global energy revolution and setting a powerful example for Global South cooperation," he said.                    。

二 | 不过，目前相关商品链接仍能在B站搜索到，销售店铺是“韦东奕图书”，销量还在继续增加。截至8月23日上午，《小学数学解题训练1—6年级超详细答案视频讲解》已售出超过2万本，相关初中产品也售出1万多本。这套练习册覆盖1至9年级，每个年级一套、每套3册。此前售价分别为39.8元和49.8元。

三 | 按照公开销量和标价粗略计算，两类产品对应的成交金约130万元，但这并不等同于实际收入。

店铺销量截图这场销售发生在4天前。8月18日晚，韦东奕时隔一年更新B站账号，发布视频《一道有趣的数学题》。视频中没有本人出镜，只展示了一道小学四年级数学题及解题方法。与此同时，他的B站小店上新了两套数学解题能力训练练习册，商品页面标注“韦东奕主编”，并印有他的名字和照片。北京大学已向媒体确认，上述B站账号确实为韦东奕本人账号。

四 | 练习册出版社龙门书局也对媒体表示，这套图书确实由韦东奕本人亲自主编，内容偏向培优方向，本周刚刚上线，目前龙门书局官方账号以及韦东奕个人账号均有售卖。不过这两套练习册还有其他销售入口。8月18日，韦东奕堂哥韦晶洲、堂姐韦丹青的抖音账号，同步上线了相关数学题视频，并挂出了两套练习册的购买链接。

五 | 商品店铺同样是“韦东奕图书”。

韦东奕图书营业执照截图公开的营业执照显示，“韦东奕图书”所属公司，是杭州奕数文化产业发展有限公司，成立于2026年5月22日，法定代表人为曹恩铭，注册资金100万元，业务类型为零售。其经营范围包括出版物互联网销售、出版物批发、出版物零售，以及教育咨询、技术开发、数字广告发布、文具用品零售、日用百货销售等。事实上，教师、科学家出版教材、科普书和习题集，是知识传播中常见且成熟的一种方式。知名华裔数学家、菲尔兹奖得主陶哲轩，早在15岁就出版了《陶哲轩教你学数学》，介绍解题策略和数学思维。因此，在该练习册上架后，不少网友表示支持，认为这并无不妥。但外界也出现了关于韦东奕本人是否主动参与此次卖书的猜测。自走红以来，在大众认知里，韦东奕是一个专注数学、生活俭朴、与互联网保持距离的数学家。

六 | 媒体曾报道，他几乎不看电视、没有微信，除了查资料很少上网，爱听收音机，最喜欢的事情就是做数学题。

七 | 2025年6月，他在抖音、B站、小红书等平台开通个人账号，迅速积累千万粉丝，但此后长期没有更新。从公开信息看，围绕这两套练习册，除了出版社官方销售，的确出现了个人账号、亲属账号以及相关公司参与内容发布和商品销售的情况。不过，目前的公开资料还不足以确认这些主体之间的具体关系，也无法判断韦东奕本人在其中扮演什么角色。至于商品为何从韦东奕的B站小店消失，韦东奕本人也尚未公开回应。记者：杨智杰编辑：闵杰运营编辑：王琳