supprime les parenthèses puis réduit
A = (x + 3) + ( 4 x - 5)
= x + 3 + 4 x - 5
= 5 x - 2
B = 4 *(5 - x)
= 20 - 4 x
C = - (8 a + 3) - 4 a
= - 8 a - 3 - 4 a
= - 12 a - 3
= - 3(4 a + 1)
D = - 6(x +1)
= - 6 x - 6
= 6( - x - 1)
E = - 8(- 5 - 3 y)
= 40 + 24 y
= 8(5 + 3 y)
F = - (x - 5) - 3(7 - 4 x) + (x - 6)
= - x + 5 - 21 + 12 x + x - 6
= 12 x - 22
= 2(6 x - 11)
EX5
1) calculer A x B - 3 C = 7 x (- 3) - 3(- 2) = - 21 + 6 = - 15
A = 7 B = - 3 C = - 2
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supprime les parenthèses puis réduit
A = (x + 3) + ( 4 x - 5)
= x + 3 + 4 x - 5
= 5 x - 2
B = 4 *(5 - x)
= 20 - 4 x
C = - (8 a + 3) - 4 a
= - 8 a - 3 - 4 a
= - 12 a - 3
= - 3(4 a + 1)
D = - 6(x +1)
= - 6 x - 6
= 6( - x - 1)
E = - 8(- 5 - 3 y)
= 40 + 24 y
= 8(5 + 3 y)
F = - (x - 5) - 3(7 - 4 x) + (x - 6)
= - x + 5 - 21 + 12 x + x - 6
= 12 x - 22
= 2(6 x - 11)
EX5
1) calculer A x B - 3 C = 7 x (- 3) - 3(- 2) = - 21 + 6 = - 15
A = 7 B = - 3 C = - 2