1) х2 - 5х - 14 =0
2) х2 + 6х - 27 = 0
3) х2 + 8х + 15 = 0
4) х2 - 5х + 6 = 0
5) 10х2 + 7х - 3 = 0
6) - 3х2 + 7х + 6 = 0

х2 - це ікс квадрат
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