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Sagot :

1. f(x) = x ( 1 - x ) - x ( 3x + 2)

f(x) = x - x² - 3x² -2x

f(x) = -1x - 4x²

2. a. ( 1 - 2x)² ⩾ 4

(1-2x)²⩾2²

1 - 2x ⩾ 2

-1 ⩾ 2x

-0,5 ⩾ x

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