2х²-х+0,5=0
а=2 в=-1 с=0,5
2х²+6х-5=3х²+4х-5
-х²+2х=0
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2х²-х+0,5=0
а=2 в=-1 с=0,5
2х²+6х-5=3х²+4х-5
-х²+2х=0