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六上数学：正方形边长增加13，面积增加21平方厘米
六上数学+奥数41/95
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App05:08![六年级奥数：[方法提升]求它的整数部分是多少？](http://p26-sign.bdxiguaimg.com/tos-cn-i-0026/4b05afafe234403e8f382af447230548~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=20241118093404ECFCC2D14D50627F095C&requestFrom=704&version_code=80402&x-expires=1763429645&x-signature=Iu2iQQhWZ%2Fg4Ef2lXNZTVcExmRw%3D)
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App05:23![六年级奥数：讲透裂和计算中的数学知识[乘1/N]](http://p26-sign.bdxiguaimg.com/tos-cn-i-0026/26c9ead8f4554f76a470a62d9e069dca~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=20241118093404ECFCC2D14D50627F095C&requestFrom=704&version_code=80402&x-expires=1763429645&x-signature=8MLh8wpBmck6JYyyOcRIRe%2FDmac%3D)
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