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Sagot :

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bonsoir

f (x) = -4 x /5 + 3

f ( 7/6) = - 4/5 * 7/6 + 3 = - 28/30 + 3 = - 14/15 + 45/15 = 31/15

- 4 x /5 + 3 = - 1/2

- 8 x /10 + 30/10 = 5 /10

- 8 x = 5 - 30

- 8 x = - 25

x = 25/8 = 3.125

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