Математика. Материалы курса: Тест 2.2.2. (часть2). Скалярное произведение векторов. Длина вектора. Векторное произведение векторов. Смешанное произведение векторов

Тест 2.2.2. (часть2). Скалярное произведение векторов. Длина вектора. Векторное произведение векторов. Смешанное произведение векторов

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Cannot connect to external database:

错误：数据库连接失败

可能是数据库过载或是没有正确运行

网站管理员还应该检查config.php文件里数据库详细配置是否正确

(Access denied for user 'do-mooc-log'@'localhost' (using password: YES))

line 105 of /admin/tool/log/store/database/classes/log/store.php: call to debugging()
line 141 of /admin/tool/log/store/database/classes/log/store.php: call to logstore_database\log\store->init()
line 106 of /admin/tool/log/classes/helper/buffered_writer.php: call to logstore_database\log\store->insert_event_entries()
line 132 of /admin/tool/log/classes/helper/buffered_writer.php: call to logstore_database\log\store->flush()
line 305 of /admin/tool/log/store/database/classes/log/store.php: call to logstore_database\log\store->helper_dispose()
line 195 of /admin/tool/log/classes/log/manager.php: call to logstore_database\log\store->dispose()
line 155 of /lib/classes/shutdown_manager.php: call to tool_log\log\manager->dispose()
line ? of unknownfile: call to core_shutdown_manager::shutdown_handler()