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x² - 6 x + 9 = ( x - 3 )²

10.2 L = 1 020 cL

3 x - 2 > 1

3 x > 1 + 2

3 x > 3

x > 1

2 x - 1 = 3

2 x = 4

x = 2

10⁷ x 10 ⁻² = 10 ⁵

x² =  4

x = 2 ou - 2

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