25-12х+(х-5)(х+5)-(5-х)\2=

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25 - 12x + (x - 5)(x + 5) - (5 - x)/2

First, let's simplify the expression:

= 25 - 12x + (x^2 - 5x + 5x - 25) - (5 - x)/2
= 25 - 12x + (x^2 - 25) - (5 - x)/2
= 25 - 12x + x^2 - 25 - (5 - x)/2
= 25 - 12x + x^2 - 25 - (5/2 - x/2)
= 25 - 12x + x^2 - 25 - 5/2 + x/2
= -12x + x^2 - 25 - 25 - 5/2 + x/2
= x^2 - 12x - 50 - 5/2 + x/2
= x^2 - 12x - 50 - 2.5 + 0.5x
= x^2 - 11.5x - 52.5

Therefore, the simplified expression is x^2 - 11.5x - 52.5.