Réponse:
E.6
a = 2(x-2) + 3(x+2)
= 2x - 4 + 3x + 6
= 5x + 2
b = 4(1-x) + (3x + 1)
= 4 - 4x + 3x + 1
= -x + 5
E7
3(2x - 1) - 3(5 - 2x)
= 6x - 3 - 15 + 6x
= 12x - 18
2(1-x) - 6(x + 2)
= 2 - 2x - 6x - 12
= -8x - 10
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Réponse:
E.6
a = 2(x-2) + 3(x+2)
= 2x - 4 + 3x + 6
= 5x + 2
b = 4(1-x) + (3x + 1)
= 4 - 4x + 3x + 1
= -x + 5
E7
3(2x - 1) - 3(5 - 2x)
= 6x - 3 - 15 + 6x
= 12x - 18
2(1-x) - 6(x + 2)
= 2 - 2x - 6x - 12
= -8x - 10