6x^2-11x-30 надо представить в виде произведеия
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6x²-11x-30=0 => x=(11±29)/12; x1=10/3, x2=-3/2 =>
6x²-11x-30=6(x-x1)(x-x2)=(6x-20)(x+1,5) или (3x-10)(2x+3) это не правильно
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