Не решая следующие уравнения, определите, сколько корней они имеют: - 1) 2x +5x — 7 = 0; 3) 4x2 + 4x+1= 0; 2) 3x° — 7х – 8 = 0; 4) 9x2 - 6x +2=0.​
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