It's the most explicit math book I ever read. The explanations and the examples provided are so clear that you will have no problem making the exercises and the exams. I want to congratulate the authors for such a great job.
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$('span.popular').attr('title', 'Популярный');
$('span.genesis').attr('title', 'Ограничение скачивания: не более 2х файлов одновременно');