Ответы на вопрос:
2,27-2x=0,73 -2х=0.73-2.27 -2х=-1.54 х=0.77 6.08+12x=30,7412х=30.74-6.0812х=24.66х= 2.055
X² - 3x - 5 = 0 d = 9 + 20 = 29 x1 = (3-√29)/2 x2 = (3+√29)/2 1) 1/x1 + 1/x2 = 2/(3-√29) + 2/(3+√29) = (6+2√29+6-2√29)/(9-29) = 12/(-20) = -3/5 = -0,6 2) x1² + x2² = (3-√29)² + (3+√29)² = 9 -6√29 + 29 + 9 + 6√29 + 29 = 76 3) x1/x2 + x2/x1 = (x1² + x2²)/(x1*x2) = 76/((3-√29)(3+√29)) = 76/(9-29) = 76/(-20) = -19/5 = -3,8
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