Bonsoir, il faudrait me résoudre en détail : - f(x)=3x(2-7x)-4x(7-2x)
f(x)<0

-g(x)=(9x+6)(x-1)+(3x+2)(3+2x)
g(x)< (ou égal) 0

-h(x)=(7x-5)²-16x²
h(x)> (ou égal) 0

Merci. :)
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