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taliamanigold
@taliamanigold
December 2020
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Moi et. Pus m’aider svp. Révisions : Calcul littéral 3ème
N°1 : Développe les expressions suivantes :
a) - 2x (2x - 3)
d) 3 (2x - 4) - 2 (3x - 1)
b) 3x2 (3x - 3) + 5 x2 - 8 x3 c) - 2 (2x2 + 5 x-6)
e) 4 (- 2x + 5) + 2 (3x - 4)+ x f) 2 (5x - 3) - 3 (3x + 4)
h) 2x - (3x - 6) - 9
i) 4 - 2(6x +2) - 2 (2x - 4)
k) 3 - 2(4x + 2) - 5x
1) 4x + (2x + 6) - (5x - 7) - 2
g) – 2x (2x2 + x - 3)
j) 7 - (2x + 1) + 4x
Solutions dans le désordre : -* +12; *-3: 2x+6 - 4x2 - 10x + 12 ; x-18;
- 13x -1 ; x+11 ; - 4x2 + 6x : 4x® – 2x2 + 6x : -10 : - 16x + 8 ; 23 - 4x2
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Nexya02
A) =-2x(2x-3)
=-4x2( x au carré) +6x
b) =3x2(3x-3)+5+2-8x3
=6+9+10-24
=25-24
=1
c) =-2(2x2+5x-6)
=-2(-2+5x)
=-4+5x
d) =-3(2x-4)-2(3x-1)
=6x-12-6x-3
=-15
e) =4(-2x+5)+2(3x-4)
=-8+20+6x-8
=-2x+12
f) =2(5x-3)-3(3x+4)
=10x-6-9x-12
=x-18
Désolé mais j’ai pas pu faire les autres
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=-4x2( x au carré) +6x
b) =3x2(3x-3)+5+2-8x3
=6+9+10-24
=25-24
=1
c) =-2(2x2+5x-6)
=-2(-2+5x)
=-4+5x
d) =-3(2x-4)-2(3x-1)
=6x-12-6x-3
=-15
e) =4(-2x+5)+2(3x-4)
=-8+20+6x-8
=-2x+12
f) =2(5x-3)-3(3x+4)
=10x-6-9x-12
=x-18
Désolé mais j’ai pas pu faire les autres