не решая следующие уравнения определите знаки его корней
1)x²+7x-1=0
2)x²-7x+1=0
3)5x²+17x+16=0
4)x²-18x+17=0
5)x²-2x-1=0
6)x²-15x+56=0
7)19x²-23x+5=0
8)2x²+5x+6=0
9)11x²-9x-0,02=0
10)5x²-x-108=0
11)x²-2,7x+1=0
12)3x²-12x-7=0
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