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Sagot :

SANDEC

Réponse:

16. -8x+20=-15x+10

7x=-10

x=-10/7

17. 11x-6x²=-18

-6x²+11x+18 = 0

polynôme de degré deux

donc delta b²-4ac = 11²-4×18×(-6) = 553

deux sol (-11-sqrt(553))/(2×(-6))

et (-11+sqrt(553))/(2×(-6))

sqrt = Racine carre

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