( ! ) Warning: file_get_contents(https://video.getaclass.ru/api/api.php?filelist%5B0%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+1+%D0%9A%D0%B2%D0%B0%D0%B4%D1%80%D0%B0%D1%82+%D1%81%D1%83%D0%BC%D0%BC%D1%8B_1080p.mp4&filelist%5B0%5D%5Bext%5D=mp4&filelist%5B0%5D%5Bmime%5D=video%2Fmp4&filelist%5B0%5D%5Bquality%5D=1080p&filelist%5B1%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+1+%D0%9A%D0%B2%D0%B0%D0%B4%D1%80%D0%B0%D1%82+%D1%81%D1%83%D0%BC%D0%BC%D1%8B_720p.mp4&filelist%5B1%5D%5Bext%5D=mp4&filelist%5B1%5D%5Bmime%5D=video%2Fmp4&filelist%5B1%5D%5Bquality%5D=720p&filelist%5B2%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+1+%D0%9A%D0%B2%D0%B0%D0%B4%D1%80%D0%B0%D1%82+%D1%81%D1%83%D0%BC%D0%BC%D1%8B_480p.mp4&am in /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php on line 77
Call Stack
#TimeMemoryFunctionLocation
10.0000233992{main}( ).../index.php:0
20.0092795912Core::printContent( ).../index.php:21
30.0092796480Core::fetchContent( ).../class.core.php:190
40.0092796800CEdu->run( ).../class.core.php:142
50.0099814504Controller->run( ).../controller.edu.php:43
60.0101838560Command->execute( ).../class.controller.php:31
70.0106854320CommandCEduView->doExecute( ).../class.command.php:33
80.0107864960CommandCEduView->process( ).../cedu.view.php:11
90.0126949432CommandCEduView->videoFullLoad( ).../cedu.view.php:46
100.01421001552VideoHostingApi->getDownloadLink( ).../cedu.view.php:247
110.01431012960file_get_contents ( ).../class.videohostingapi.php:77

( ! ) Warning: file_get_contents(https://video.getaclass.ru/api/api.php?filelist%5B0%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+2+%D0%9A%D0%B2%D0%B0%D0%B4%D1%80%D0%B0%D1%82+%D1%80%D0%B0%D0%B7%D0%BD%D0%BE%D1%81%D1%82%D0%B8_1080p.mp4&filelist%5B0%5D%5Bext%5D=mp4&filelist%5B0%5D%5Bmime%5D=video%2Fmp4&filelist%5B0%5D%5Bquality%5D=1080p&filelist%5B1%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+2+%D0%9A%D0%B2%D0%B0%D0%B4%D1%80%D0%B0%D1%82+%D1%80%D0%B0%D0%B7%D0%BD%D0%BE%D1%81%D1%82%D0%B8_720p.mp4&filelist%5B1%5D%5Bext%5D=mp4&filelist%5B1%5D%5Bmime%5D=video%2Fmp4&filelist%5B1%5D%5Bquality%5D=720p&filelist%5B2%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+2+%D0%9A%D0%B2%D0%B0%D0%B4%D1%80%D0%B0%D1%82+%D1%80 in /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php on line 77
Call Stack
#TimeMemoryFunctionLocation
10.0000233992{main}( ).../index.php:0
20.0092795912Core::printContent( ).../index.php:21
30.0092796480Core::fetchContent( ).../class.core.php:190
40.0092796800CEdu->run( ).../class.core.php:142
50.0099814504Controller->run( ).../controller.edu.php:43
60.0101838560Command->execute( ).../class.controller.php:31
70.0106854320CommandCEduView->doExecute( ).../class.command.php:33
80.0107864960CommandCEduView->process( ).../cedu.view.php:11
90.0126949432CommandCEduView->videoFullLoad( ).../cedu.view.php:46
103.02841006320VideoHostingApi->getDownloadLink( ).../cedu.view.php:247
113.02841017920file_get_contents ( ).../class.videohostingapi.php:77

( ! ) Warning: file_get_contents(https://video.getaclass.ru/api/api.php?filelist%5B0%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+3+%D0%A0%D0%B0%D0%B7%D0%BD%D0%BE%D1%81%D1%82%D1%8C+%D0%BA%D0%B2%D0%B0%D0%B4%D1%80%D0%B0%D1%82%D0%BE%D0%B2_1080p.mp4&filelist%5B0%5D%5Bext%5D=mp4&filelist%5B0%5D%5Bmime%5D=video%2Fmp4&filelist%5B0%5D%5Bquality%5D=1080p&filelist%5B1%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+3+%D0%A0%D0%B0%D0%B7%D0%BD%D0%BE%D1%81%D1%82%D1%8C+%D0%BA%D0%B2%D0%B0%D0%B4%D1%80%D0%B0%D1%82%D0%BE%D0%B2_720p.mp4&filelist%5B1%5D%5Bext%5D=mp4&filelist%5B1%5D%5Bmime%5D=video%2Fmp4&filelist%5B1%5D%5Bquality%5D=720p&filelist%5B2%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+3+%D0%A0%D0%B0%D0%B7%D0%BD% in /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php on line 77
Call Stack
#TimeMemoryFunctionLocation
10.0000233992{main}( ).../index.php:0
20.0092795912Core::printContent( ).../index.php:21
30.0092796480Core::fetchContent( ).../class.core.php:190
40.0092796800CEdu->run( ).../class.core.php:142
50.0099814504Controller->run( ).../controller.edu.php:43
60.0101838560Command->execute( ).../class.controller.php:31
70.0106854320CommandCEduView->doExecute( ).../class.command.php:33
80.0107864960CommandCEduView->process( ).../cedu.view.php:11
90.0126949432CommandCEduView->videoFullLoad( ).../cedu.view.php:46
106.10081012400VideoHostingApi->getDownloadLink( ).../cedu.view.php:247
116.10081024104file_get_contents ( ).../class.videohostingapi.php:77

( ! ) Warning: file_get_contents(https://video.getaclass.ru/api/api.php?filelist%5B0%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+4+%D0%9F%D0%BB%D0%BE%D1%89%D0%B0%D0%B4%D1%8C+%D0%B8+%D1%81%D1%83%D0%BC%D0%BC%D0%B0+%D1%81%D1%82%D0%BE%D1%80%D0%BE%D0%BD_1080p.mp4&filelist%5B0%5D%5Bext%5D=mp4&filelist%5B0%5D%5Bmime%5D=video%2Fmp4&filelist%5B0%5D%5Bquality%5D=1080p&filelist%5B1%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+4+%D0%9F%D0%BB%D0%BE%D1%89%D0%B0%D0%B4%D1%8C+%D0%B8+%D1%81%D1%83%D0%BC%D0%BC%D0%B0+%D1%81%D1%82%D0%BE%D1%80%D0%BE%D0%BD_720p.mp4&filelist%5B1%5D%5Bext%5D=mp4&filelist%5B1%5D%5Bmime%5D=video%2Fmp4&filelist%5B1%5D%5Bquality%5D=720p&filelist%5B2%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0 in /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php on line 77
Call Stack
#TimeMemoryFunctionLocation
10.0000233992{main}( ).../index.php:0
20.0092795912Core::printContent( ).../index.php:21
30.0092796480Core::fetchContent( ).../class.core.php:190
40.0092796800CEdu->run( ).../class.core.php:142
50.0099814504Controller->run( ).../controller.edu.php:43
60.0101838560Command->execute( ).../class.controller.php:31
70.0106854320CommandCEduView->doExecute( ).../class.command.php:33
80.0107864960CommandCEduView->process( ).../cedu.view.php:11
90.0126949432CommandCEduView->videoFullLoad( ).../cedu.view.php:46
109.04981018152VideoHostingApi->getDownloadLink( ).../cedu.view.php:247
119.04991030016file_get_contents ( ).../class.videohostingapi.php:77

( ! ) Warning: file_get_contents(https://video.getaclass.ru/api/api.php?filelist%5B0%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+5+%D0%9F%D0%BB%D0%BE%D1%89%D0%B0%D0%B4%D1%8C+%D0%B8+%D1%80%D0%B0%D0%B7%D0%BD%D0%BE%D1%81%D1%82%D1%8C+%D1%81%D1%82%D0%BE%D1%80%D0%BE%D0%BD_1080p.mp4&filelist%5B0%5D%5Bext%5D=mp4&filelist%5B0%5D%5Bmime%5D=video%2Fmp4&filelist%5B0%5D%5Bquality%5D=1080p&filelist%5B1%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B0+5+%D0%9F%D0%BB%D0%BE%D1%89%D0%B0%D0%B4%D1%8C+%D0%B8+%D1%80%D0%B0%D0%B7%D0%BD%D0%BE%D1%81%D1%82%D1%8C+%D1%81%D1%82%D0%BE%D1%80%D0%BE%D0%BD_720p.mp4&filelist%5B1%5D%5Bext%5D=mp4&filelist%5B1%5D%5Bmime%5D=video%2Fmp4&filelist%5B1%5D%5Bquality%5D=720p&filelist%5B2%5D%5Bfilename%5D=%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%B0 in /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php on line 77
Call Stack
#TimeMemoryFunctionLocation
10.0000233992{main}( ).../index.php:0
20.0092795912Core::printContent( ).../index.php:21
30.0092796480Core::fetchContent( ).../class.core.php:190
40.0092796800CEdu->run( ).../class.core.php:142
50.0099814504Controller->run( ).../controller.edu.php:43
60.0101838560Command->execute( ).../class.controller.php:31
70.0106854320CommandCEduView->doExecute( ).../class.command.php:33
80.0107864960CommandCEduView->process( ).../cedu.view.php:11
90.0126949432CommandCEduView->videoFullLoad( ).../cedu.view.php:46
1012.02901023528VideoHostingApi->getDownloadLink( ).../cedu.view.php:247
1112.02901035584file_get_contents ( ).../class.videohostingapi.php:77

( ! ) Warning: Cannot modify header information - headers already sent by (output started at /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php:77) in /var/www/www.getaclass.ru/htdocs/lib/class.core.php on line 194
Call Stack
#TimeMemoryFunctionLocation
10.0000233992{main}( ).../index.php:0
20.0092795912Core::printContent( ).../index.php:21
315.50966482744header ( ).../class.core.php:194
Геометрическая алгебра. Курс "Просто математика" | Бесплатные обучающие видео и уроки по физике и математике для школьников на образовательном ресурсе GetAClass

Геометрическая алгебра

За три коротких урока мы объясним вам, как с помощью простых геометрических чертежей легко выводятся алгебраические формулы сокращённого умножения. Ещё древние вавилоняне поняли, что два сомножителя удобно изображать сторонами прямоугольника, а их произведение — площадью. Такие прямоугольники можно складывать и вычитать, разрезать их на части и перекладывать. Правила становятся наглядными и хорошо запоминаются. А затем мы займёмся вавилонской задачей, с которой началась история алгебры: «площадь и периметр прямоугольного поля известны, найди его стороны». Мы покажем вам простой и полезный приём, с помощью которого решается любое квадратное уравнение.

 

Измерить вес тела можно также пружинными весами (рис. 3). Груз давит на дно чаши и сжимает пружину внутри весов. Чем больше вес тела, тем больше сжатие пружины. Чтобы измерять вес, пружинные весы нужно предварительно проградуировать, используя эталонные грузы. Как возникает действие груза на пружинные весы? Известно, что все тела притягиваются Землей силой тяжести. Груз давит на чашу весов силой, равной по величине силе тяжести, которая уравновешивается пружиной. Эту силу называют весом тела.

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