СРОЧНО1213(2) , 1215(2), 1216(2)

Question

СРОЧНО
1213(2) , 1215(2), 1216(2)

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Answer 1

1213(2) ......  21:10=2,1
1215(2) ......  2,9=2+9/10=2+0,9
1216(2) ......  4/5:2ц2/3+3ц1/2 = 4/5:8/3+7/2 = 4/5*3/8+7/2 =
= 12/40+7/2 = 3/10+35/10 = 38/10 = 3,8