найдите сумму и произведения корней уравнения:
1) х²-13х+20=0
2) 7y²+12y=0
3) t²-20=0
4) 3x²-5x+2=0
5) 3z²-20z=0
6) 6t²-1=0
7) y²+33y-40=0
8) -2z²+z=0​
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