ex 42
37 x 54 - 40 x 37 + 37 x (-23) + 37 x 9 =
37(54 - 40 - 23 + 9) = (on a mis 37 en facteur commun)
37(54 + 9 - 40 - 23) =
37(63 - 63) = 0
ex 44
a)
A = 7x oui
B = 12 + 15x non
C = 4(2a -3) oui
D = (6x - 1)(x + 8) oui
E = -2x + x² non
F = 4t + 4 non
b)
B = 3(4 + 5x)
E = x(-2 + x)
F = 4(t + 1)
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ex 42
37 x 54 - 40 x 37 + 37 x (-23) + 37 x 9 =
37(54 - 40 - 23 + 9) = (on a mis 37 en facteur commun)
37(54 + 9 - 40 - 23) =
37(63 - 63) = 0
ex 44
a)
A = 7x oui
B = 12 + 15x non
C = 4(2a -3) oui
D = (6x - 1)(x + 8) oui
E = -2x + x² non
F = 4t + 4 non
b)
B = 3(4 + 5x)
E = x(-2 + x)
F = 4(t + 1)