2 11/17*2 4/15 -(13,7*1,5-21,55) и (3/20+4 1/15)+25/42*2,1

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To solve this calculation, we will follow the order of operations (parentheses, exponents, multiplication and division from left to right, and addition and subtraction from left to right).

Calculating the expression step by step:

11/17 * 2 = 22/174/15 = 4/15(13.7 * 1.5) - 21.55 = 20.55 - 21.55 = -122/17 - (-1) = 22/17 + 1 = (22 + 17) / 17 = 39/17

Now, moving on to the second part of the expression:

3/20 + 4 1/15 = 3/20 + 61/15 = 3/20 + 244/60 = 3/20 + 122/30 = 3/20 + 61/15 = (9 + 128)/60 = 137/6025/42 2.1 = 25/42 21/10 = 525/420 = 35/28 = 5/4

Combining the results of both parts:

39/17 + 5/4 = 156/68 + 85/68 = 241/68

Therefore, the value of the expression is 241/68 or approximately 3.5441.