Ответы на вопрос:
1) д = 2,56-4*0,64*1=2,56-2,56=0 один корень 2) д = 81 - 4*1*(-3) = 81 + 12 = 93 два корня 3) д = 4 - 4*(-5)*(-2,5) = 4-50=-46 корней нет 1)д = 9 - 4*1*2 = 9-8 = 1 х₁ = (-3-1)/2 = -2 х₂ = (-3 + 1)/2 = -1 2)д = 4 - 4*(-1)*24 = 4 + 96 = 100 х₁ = (2-10)/2 = -4 х₂ = (2+10)/2 = 6 3)д = 49 - 4*1*12 = 1 х₁ = (7-1)/2 = 3 х₂ = (7+1)/2 = 4 4)д = 25 - 4*(-1)*6 = 25 + 24 = 49 х₁ = (5-7)/2 = -1 х₂ = (5+7)/2 = 6
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