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Неравенства ...Задачник. Задание С3
https://drive.google.com/file/d/0B2RDrG0rMlaEZzd2TUpsSGJvWlE/view?resourcekey=0-DoW8784pjfLlVXoOGoY4RA
https://drive.google.com/file/d/0B2RDrG0rMlaEZzd2TUpsSGJvWlE/view?resourcekey=0-DoW8784pjfLlVXoOGoY4RA