Ответы на вопрос:
1) 0.2 - 2x - 2 = 0.4x
- 2x - 0.4x = - 0.2 + 2
- 2.4x = 1.8
x = - 0.75
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2) (10x - 14)(1 + x) = 0
10x + 10x^2 - 14 - 14x = 0
10x^2 - 4x - 14 = 0
2(5x^2 - 2x - 7) = 0
d = 4 - 4*5*(-7) = 4 + 140 = 144 ; v d = 12
x1 = 2 + 12 \ 10 = 1.4
x2 = 2 - 12 \ 10 = - 1
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3) x^2 - 10x = 0
x(x - 10) = 0
x - 10 = 0
x = 10
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