Ответы на вопрос:
1] 1-3x^2-15x=0 -3x(x+5)=0 x1 = 0 x2 = -5 2] -25x^2+36=0 -25x^2=-36 25x^2=36 x^2=36/25 x1=6/5 x2=-6/5 3] x^2-56x=0 x(x-56)=0 x1=0 x2=56
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