Укажите коэффиценты квадратного уравнения:
1) 1,7х² - х + 1,8 = 0
2) -3х² + 5,2 = 0
3) -5х² - 3х + 2 = 0
4) 2х² - 3х - 1 = 0
5) -х² = 0
6) -0,8х² - 9х = 0
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