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anna1143
@anna1143
September 2021
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Разложить на множители квадратный трехчлен
а) х²-х-72
б)-4b²+7b-3
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AkashiT
А)х^2-х-72=х^2-х-64-8=(х^2-8^2)-х-8=(х-8)(х+8)-(х+8)=(х+8)(х-8-1)=(х+8)(х-9) б)-4b^2+7b-3 приравняем к нулю -4b^2+7b-3=0 D=49-48=1 b=(-7+_1)/-8 b1=1 b2=3/4 -4b^2+7b-3=a(b-b1)(b-b2)=-4(b-1)(b-3/4)=(b-1)(-4b+3)=(b-1)(3-4b)
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