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Юлия1915
1 номер.
81х^2-25 x^2+16=0
56x^2=16
x^2=16/56
x^2=2/7
 2 номер
выносим х за скобки
х(3x^2-3x+3x-3)=0
x=0
3x^2-3x-3=0
найдем дискриминант, и корни его.Вот

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