2-(1 11/30 - 1,7)*1 2/7 :1 13/14

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To solve this expression, we need to first simplify the fractions:

1 11/30 - 1,7 = 1 + 11/30 - 1 + 7/10 = 11/30 + 7/10 = 37/30 + 21/30 = 58/30 = 29/15

Next, convert 1 2/7 into an improper fraction:

1 2/7 = 7/7 + 2/7 = 9/7

Now, substitute the values back into the expression:

2 - (29/15) * (9/7) / 1 13/14

= 2 - (29/15) * (9/7) ÷ (27/14)

Now, multiply the fractions inside the parentheses:

= 2 - (261/105) ÷ (27/14)

Next, divide the fractions:

= 2 - (261/105) * (14/27)

= 2 - 522/945

To simplify, find a common denominator:

= 2 * 945/945 - 522/945

= 1890/945 - 522/945

= (1890 - 522) / 945

= 1368 / 945

Therefore, the final answer is:

1368 / 945