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数学课本有个“你知道吗?”的版块,我觉得非常有意思。“亩”到底有多大?为什么数字会有负数?字母可以代替数字来求解吗?带着许多的疑问我开始了探索的旅程。
","type":1},{"source_platform":"local","subtitle_align":"center","subtitle_color":"#ffffff","subtitle_font_size":"medium","subtitle_style_id":9,"text":"“亩”的大小","type":6},{"img_height":770,"img_url":"https://ss-mpvolc.meipian.me/users/57546192/21c06a4438a04f1998ac45263bbd57a4__jpeg.heic","img_width":2902,"source":0,"source_platform":"local","splicing_template_id":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNTc1NDYxOTIvMjFjMDZhNDQzOGEwNGYxOTk4YWM0NTI2M2JiZDU3YTRfX2pwZWcuaGVpYw==/nickname/6Zuo6JG1/userid/NTc1NDYxOTI=/sign/f864d40fb7758c0a8f4d00ff52776b1a"},{"source":0,"source_platform":"local","splicing_template_id":0,"text":"“亩”在古代是一个模糊的概念,最早起源于夏、商两代的井田模型,到了后来,流传最广的说法则是以5尺为步,以240步为亩,即边长为240步的正方形的面积为一亩,也就是我们常说的“一亩见方”。至于一步究竟是多长,又是一个变化的量。
根据史料记载:\"司马法,六尺为步,步百为亩。泰孝公制,二百四十步为亩。宋程颐曰:古者百亩,止当今之四十亩。今之百亩,当古之二百五十亩。\"由此可见,每个时代的甚至同一个时代不同地域,一亩的大小并不标准,大大小小的没有统一的说法。
","type":1},{"img_height":328,"img_url":"https://ss-mpvolc.meipian.me/users/57546192/f22f952f8f574fa7b51f3239f2821132__jpeg.heic","img_width":640,"source":0,"source_platform":"local","splicing_template_id":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNTc1NDYxOTIvZjIyZjk1MmY4ZjU3NGZhN2I1MWYzMjM5ZjI4MjExMzJfX2pwZWcuaGVpYw==/nickname/6Zuo6JG1/userid/NTc1NDYxOTI=/sign/f864d40fb7758c0a8f4d00ff52776b1a"},{"source":0,"source_platform":"local","splicing_template_id":0,"text":"
新中国成立之后,为了与国际接轨,中国重新定义了土地面积的计算方式。我们引入了\"公顷\"的概念,与国际社会一样,用公顷当做面积的计量单位,但一公顷等于10000平方米,即长宽都是10000米的天地,中国很少有一块地那么大的,基本都是小块小块的土地,所以公顷用起来不方便。如果用亩的话,古时候中国的\"亩\"没有统一的数量标准,最终科学家想到一个折中的办法,就是在亩和公顷之间做一个换算,后来规定中国的15亩等于一公顷,也就是等于10000平方米,这样算来一亩就约等于667平方米了,这个制度也就一直沿用至今了。
爷爷告诉我:“蔬菜大棚,如果按照长10米宽6米的标准建设的话,大小就差不多是1亩。”
","type":1},{"img_height":2666,"img_url":"https://ss-mpvolc.meipian.me/users/57546192/6ad441973ba14ef696164287e7febfd5__jpeg.heic","img_width":2000,"source":0,"source_platform":"local","splicing_template_id":0,"text":"为了更好地知道亩和分有多大,我和爷爷用卷尺测量了一个房间的长和宽,并算出面积,然后再算了1亩大约是几个房间这么大。
","type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNTc1NDYxOTIvNmFkNDQxOTczYmExNGVmNjk2MTY0Mjg3ZTdmZWJmZDVfX2pwZWcuaGVpYw==/nickname/6Zuo6JG1/userid/NTc1NDYxOTI=/sign/f864d40fb7758c0a8f4d00ff52776b1a"},{"source_platform":"local","subtitle_align":"center","subtitle_color":"#ffffff","subtitle_font_size":"medium","subtitle_style_id":9,"text":"负数的认识","type":6},{"img_height":2000,"img_url":"https://ss-mpvolc.meipian.me/users/57546192/23445c7335fb42f4b3fc70d4e9c85710__jpeg.heic","img_width":2598,"source":0,"source_platform":"local","splicing_template_id":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNTc1NDYxOTIvMjM0NDVjNzMzNWZiNDJmNGIzZmM3MGQ0ZTljODU3MTBfX2pwZWcuaGVpYw==/nickname/6Zuo6JG1/userid/NTc1NDYxOTI=/sign/f864d40fb7758c0a8f4d00ff52776b1a"},{"img_height":2328,"img_url":"https://ss-mpvolc.meipian.me/users/57546192/8d282d24aa774f49afaaee87d6c8697f__jpeg.heic","img_width":2000,"source":0,"source_platform":"local","splicing_template_id":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNTc1NDYxOTIvOGQyODJkMjRhYTc3NGY0OWFmYWFlZTg3ZDZjODY5N2ZfX2pwZWcuaGVpYw==/nickname/6Zuo6JG1/userid/NTc1NDYxOTI=/sign/f864d40fb7758c0a8f4d00ff52776b1a"},{"img_height":720,"img_width":1280,"source_platform":"local","type":3,"video_length":52,"video_thumbnail":"https://ss-mpvolc.meipian.me/users/57546192/e0b4740709b345049e3062f2a523762e__jpg.heic","video_url":"http://video.ivwen.com/users/57546192/21ec96a1737d438eaf9744721636f1f8.mp4"},{"source_platform":"local","subtitle_align":"center","subtitle_color":"#ffffff","subtitle_font_size":"medium","subtitle_style_id":9,"text":"用字母表示数","type":6},{"img_height":1282,"img_url":"https://ss-mpvolc.meipian.me/users/57546192/fd5de825a3b340a882653b86155d97da__jpeg.heic","img_width":3022,"source":0,"source_platform":"local","splicing_template_id":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNTc1NDYxOTIvZmQ1ZGU4MjVhM2IzNDBhODgyNjUzYjg2MTU1ZDk3ZGFfX2pwZWcuaGVpYw==/nickname/6Zuo6JG1/userid/NTc1NDYxOTI=/sign/f864d40fb7758c0a8f4d00ff52776b1a"},{"source":0,"source_platform":"local","splicing_template_id":0,"text":"我上网查阅了关于用字母表示数的知识,发现代数真是一个奇妙又复杂的学问。韦达一生致力于数学研究,他用字母表示数解决了很多复杂的问题,做出了很多重要贡献,最著名的就是在著作《论方程的识别与订正》中建立了方程根与系数的关系。由于韦达最早发现代数方程的根与系数之间有这种关系,人们把这个关系称为韦达定理。
在平时的学习中会遇上很多数学问题,我也要向韦达那样,善于动脑,不断探究!
——五2班 周子明
","type":1},{"img_height":640,"img_url":"https://ss-mpvolc.meipian.me/users/57546192/95f5354125f84743ab8731acbb449da8__jpeg.heic","img_width":640,"source":0,"source_platform":"local","splicing_template_id":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNTc1NDYxOTIvOTVmNTM1NDEyNWY4NDc0M2FiODczMWFjYmI0NDlkYThfX2pwZWcuaGVpYw==/nickname/6Zuo6JG1/userid/NTc1NDYxOTI=/sign/f864d40fb7758c0a8f4d00ff52776b1a"},{"source":0,"source_platform":"local","splicing_template_id":0,"text":"编辑:五2班 周子明
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","type":1},{"source_platform":"local","subtitle_align":"center","subtitle_color":"#ffffff","subtitle_font_size":"medium","subtitle_style_id":9,"text":"“亩”的大小","type":6},{"img_height":770,"img_url":"https://ss-mpvolc.meipian.me/users/57546192/21c06a4438a04f1998ac45263bbd57a4__jpeg.heic","img_width":2902,"source":0,"source_platform":"local","splicing_template_id":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNTc1NDYxOTIvMjFjMDZhNDQzOGEwNGYxOTk4YWM0NTI2M2JiZDU3YTRfX2pwZWcuaGVpYw==/nickname/6Zuo6JG1/userid/NTc1NDYxOTI=/sign/f864d40fb7758c0a8f4d00ff52776b1a"},{"source":0,"source_platform":"local","splicing_template_id":0,"text":"“亩”在古代是一个模糊的概念,最早起源于夏、商两代的井田模型,到了后来,流传最广的说法则是以5尺为步,以240步为亩,即边长为240步的正方形的面积为一亩,也就是我们常说的“一亩见方”。至于一步究竟是多长,又是一个变化的量。
根据史料记载:\"司马法,六尺为步,步百为亩。泰孝公制,二百四十步为亩。宋程颐曰:古者百亩,止当今之四十亩。今之百亩,当古之二百五十亩。\"由此可见,每个时代的甚至同一个时代不同地域,一亩的大小并不标准,大大小小的没有统一的说法。
","type":1},{"img_height":328,"img_url":"https://ss-mpvolc.meipian.me/users/57546192/f22f952f8f574fa7b51f3239f2821132__jpeg.heic","img_width":640,"source":0,"source_platform":"local","splicing_template_id":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNTc1NDYxOTIvZjIyZjk1MmY4ZjU3NGZhN2I1MWYzMjM5ZjI4MjExMzJfX2pwZWcuaGVpYw==/nickname/6Zuo6JG1/userid/NTc1NDYxOTI=/sign/f864d40fb7758c0a8f4d00ff52776b1a"},{"source":0,"source_platform":"local","splicing_template_id":0,"text":"
新中国成立之后,为了与国际接轨,中国重新定义了土地面积的计算方式。我们引入了\"公顷\"的概念,与国际社会一样,用公顷当做面积的计量单位,但一公顷等于10000平方米,即长宽都是10000米的天地,中国很少有一块地那么大的,基本都是小块小块的土地,所以公顷用起来不方便。如果用亩的话,古时候中国的\"亩\"没有统一的数量标准,最终科学家想到一个折中的办法,就是在亩和公顷之间做一个换算,后来规定中国的15亩等于一公顷,也就是等于10000平方米,这样算来一亩就约等于667平方米了,这个制度也就一直沿用至今了。
爷爷告诉我:“蔬菜大棚,如果按照长10米宽6米的标准建设的话,大小就差不多是1亩。”
","type":1},{"img_height":2666,"img_url":"https://ss-mpvolc.meipian.me/users/57546192/6ad441973ba14ef696164287e7febfd5__jpeg.heic","img_width":2000,"source":0,"source_platform":"local","splicing_template_id":0,"text":"为了更好地知道亩和分有多大,我和爷爷用卷尺测量了一个房间的长和宽,并算出面积,然后再算了1亩大约是几个房间这么大。
","type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNTc1NDYxOTIvNmFkNDQxOTczYmExNGVmNjk2MTY0Mjg3ZTdmZWJmZDVfX2pwZWcuaGVpYw==/nickname/6Zuo6JG1/userid/NTc1NDYxOTI=/sign/f864d40fb7758c0a8f4d00ff52776b1a"},{"source_platform":"local","subtitle_align":"center","subtitle_color":"#ffffff","subtitle_font_size":"medium","subtitle_style_id":9,"text":"负数的认识","type":6},{"img_height":2000,"img_url":"https://ss-mpvolc.meipian.me/users/57546192/23445c7335fb42f4b3fc70d4e9c85710__jpeg.heic","img_width":2598,"source":0,"source_platform":"local","splicing_template_id":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNTc1NDYxOTIvMjM0NDVjNzMzNWZiNDJmNGIzZmM3MGQ0ZTljODU3MTBfX2pwZWcuaGVpYw==/nickname/6Zuo6JG1/userid/NTc1NDYxOTI=/sign/f864d40fb7758c0a8f4d00ff52776b1a"},{"img_height":2328,"img_url":"https://ss-mpvolc.meipian.me/users/57546192/8d282d24aa774f49afaaee87d6c8697f__jpeg.heic","img_width":2000,"source":0,"source_platform":"local","splicing_template_id":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNTc1NDYxOTIvOGQyODJkMjRhYTc3NGY0OWFmYWFlZTg3ZDZjODY5N2ZfX2pwZWcuaGVpYw==/nickname/6Zuo6JG1/userid/NTc1NDYxOTI=/sign/f864d40fb7758c0a8f4d00ff52776b1a"},{"img_height":720,"img_width":1280,"source_platform":"local","type":3,"video_length":52,"video_thumbnail":"https://ss-mpvolc.meipian.me/users/57546192/e0b4740709b345049e3062f2a523762e__jpg.heic","video_url":"http://video.ivwen.com/users/57546192/21ec96a1737d438eaf9744721636f1f8.mp4"},{"source_platform":"local","subtitle_align":"center","subtitle_color":"#ffffff","subtitle_font_size":"medium","subtitle_style_id":9,"text":"用字母表示数","type":6},{"img_height":1282,"img_url":"https://ss-mpvolc.meipian.me/users/57546192/fd5de825a3b340a882653b86155d97da__jpeg.heic","img_width":3022,"source":0,"source_platform":"local","splicing_template_id":0,"type":1,"watermark":"?meipian-watermark/bucket/ivwen/key/dXNlcnMvNTc1NDYxOTIvZmQ1ZGU4MjVhM2IzNDBhODgyNjUzYjg2MTU1ZDk3ZGFfX2pwZWcuaGVpYw==/nickname/6Zuo6JG1/userid/NTc1NDYxOTI=/sign/f864d40fb7758c0a8f4d00ff52776b1a"},{"source":0,"source_platform":"local","splicing_template_id":0,"text":"我上网查阅了关于用字母表示数的知识,发现代数真是一个奇妙又复杂的学问。韦达一生致力于数学研究,他用字母表示数解决了很多复杂的问题,做出了很多重要贡献,最著名的就是在著作《论方程的识别与订正》中建立了方程根与系数的关系。由于韦达最早发现代数方程的根与系数之间有这种关系,人们把这个关系称为韦达定理。
在平时的学习中会遇上很多数学问题,我也要向韦达那样,善于动脑,不断探究!
——五2班 周子明
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