Explications étape par étape:
F = 2+8y-4+5y-9-12y+21 = y+10
G = -12x**2+9x-2+8x-4x+28 = -12x**2+13x+26
H = -30t**2-48t-4t**2+2t-15t+6t**2= -28t**2-61t
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Explications étape par étape:
F = 2+8y-4+5y-9-12y+21 = y+10
G = -12x**2+9x-2+8x-4x+28 = -12x**2+13x+26
H = -30t**2-48t-4t**2+2t-15t+6t**2= -28t**2-61t