2 Écris le plus simplement possible.
A = 3x axb
D = 5+ 3x b
B = 3 xa + 3x b
C = 8x ax 2
E = 5 xa +3 +2
F = 2 x 3 x ax (b × c)

3 Recopie les expressions en ajoutant les
signes lorsqu'ils sont sous-entendus.
A = 3x + 2
E = 3a - 5b
B = ab- 4
F = ab + 3 x 7a
C = 5(2x-7)
G=b-a+7(3x + 7)
D = 2a(2 + 8)
H = a + a-7b+1

4 Replace les signes x dans chacune
des expressions suivantes.
E = 12ac + 35ab - 40bc
F = 1,2abc
G = 5,6 (x² - 2,5y + 32)
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