369. Не решая следующие уравнения, определите, сколько корней они имеют: 1) 2x2 + 5x – 7= 0; 3) 4x² + 4x+1=0; ) 3х2 - 2) 3x² – 7x-8=0; — = 4) 9x² - 6x +2=0. - 146​
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