Найти корни уравнения за дискриминатом или теоремой Виета, как вам удобно.
1) 5x^2-10=0
2) x^2+4x=0
3) 3x^2+7x+2=0
4) x^2-8x+16=0
5) (2x-1)(2x+1)-(x-3)(x+1)=18​
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