(11,1:3-2 1/6):1 2/21 / ( 3 5/6 + 1,5) * 3/4

По действиям )
Заранее спасибо!

(11,1 : 3 - 2 1/6) : 1 2/21 / (3 5/6 + 1,5) * 3/4 = 0,35

1) 11,1 : 3 = 3,7

2) 3,7 - 2 1/6 = 3 7/10 - 2 1/6 = 3 21/30 - 2 5/30 = 1 16/30 = 1 8/15

3) 1 8/15 : 1 2/21 = 23/15 : 23/21 = 23/15 * 21/23 = 21/15 = 7/5 = 1 2/5

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4) 3 5/6 + 1,5 = 3 5/6 + 1 1/2 = 3 5/6 + 1 3/6 = 4 8/6 = 5 2/6 = 5 1/3

5) 5 1/3 * 3/4 = 16/3 * 3/4 = 16/4 = 4

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6) 1 2/5 : 4 = 1,4 : 4 = 0,35

Ответ: 0,35.