2.1. Выпишите коэффициенты квадратного уравнения:
1) х2 –2х–1=0; 2) 3х2 +х+1=0; 3) –2х2 +3х= 0; 4) х2 –5=0; 5) –х2 +6х–7=0; 6) 12х2 = 0.
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