А1. 2) В
А2. 1) 4√5, 9, 2√21; 2) 4√5, 9, 2√21; 3) 4√5, 9, 2√21
А3. 2) √1/2
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Answers & Comments
А1. 2) В
А2. 1) 4√5, 9, 2√21; 2) 4√5, 9, 2√21; 3) 4√5, 9, 2√21
А3. 2) √1/2