найдите дискриминант и укажите число корней квадратного уравнения:
1) x²-6x+2=0
2)3x²+8x-1=0
3)-x²+8x+3=0
4)x²-10x+25=0
5)2x²-x-2 1/3=0
6) x²+16x+64=0​
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