Ответы на вопрос:
1) x(x² - 2) = x³ + 8 x³ - 2x = x³ + 8 x³ - 2x - x³ = 8 - 2x = 8 x = -4 2) (x + 5)(x - 4) - x² + 18 =0 x² - 4x + 5x - 20 - x² + 18 = 0 x - 2 = 0 x = 2
2х-(1+9х)=20 2х-1-9х=20 -7х=20+1 -7х=21 х=21: (-7) х=-3 3х-15,6=0 3х=15,6 х=15,6: 3 х=5,2 8х+2=3х-18 8х-3х=-18-2 5х=-20 х=-20: 5 х=-4
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