1 31\35 : (2-8\9:1 19\45

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To simplify this expression, we need to perform the division first and then the subtraction.

First, let's divide 2 by 8/9:

2 ÷ (8/9)
= 2 * (9/8)
= 18/8
= 9/4

Now, let's subtract 9/4 from 31/35:

31/35 - 9/4
= (314 - 935) / (35*4)
= (124 - 315) / 140
= -191 / 140

Therefore, the simplified expression is -191/140.