Решить квадратные уравнения.1.[tex] x^{2}-16=0[/tex]2.[tex] 3 x^{2} -27x=0[/tex]3.[tex] x^{2} +3x-10=0[/tex]4.[tex]2 x^{2}-3x-5=0[/tex]5.[tex] x^{2} -4x+20=0[/tex]6.[tex]x(x-2)+3x=2[/tex]
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