3x2-4=0
20x+25x2+4=0
9x2+8-18x=0
2 уровнение)25 х^2+20х+4=0
D=b^2-4ac=20^2-4(25*4)=0
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2 уровнение)25 х^2+20х+4=0
D=b^2-4ac=20^2-4(25*4)=0