21 21 21 3
-------- = -------------- = -------- = ------ или 0,75
(2√7)² 2² * (√7)² 4 * 7 4
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21 21 21 3
-------- = -------------- = -------- = ------ или 0,75
(2√7)² 2² * (√7)² 4 * 7 4