Знайти Дискримінант рівняння 1) 13х² - х - 1 = 0
2) х²-2х+1=0
3)х²+2х - 3 = 0
4)2х²-х + 5 = 0
5) 3х² - 10 х + 7 = 0
6) х² + х +1 = 0
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