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2a²-2a+2-2>2ab-b²
2(a-1)²>-(b²-2ab+2)
2(a-1)²>-(b²-2ab+1+1)
2(a-1)²>-(b-1)²-1
L≥0 P≤0 dla a,b∈R
Cbdu
pozdr
Hans