2/а²-2аb + 1/ 2b²-ab = 2/ -a×(-a+2b) + 1/ b×(2b-a) = -2b + a / ab× (-a+2b) = a-2b/ ab× (-(a-2b)) = -1/ab = - 1/ab.
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2/а²-2аb + 1/ 2b²-ab = 2/ -a×(-a+2b) + 1/ b×(2b-a) = -2b + a / ab× (-a+2b) = a-2b/ ab× (-(a-2b)) = -1/ab = - 1/ab.