Bonjour ,
1.
A = 4x−3−3x+4
= 4x-3x-3+4
=1x+1
B = −3x+2+x−5
= -3x+x+2-5
= -2x-3
C = −9x+x−8+5x
= -9x+x+5x-8
= 15x-8
D = 2−2x−4x+4−x
= 2x-4x-x+2+4
= -7x+6
2 .
Il faut remplacer les x par 3 :
Exemples :
= 4×3-3-3×3+4
= 4×3-3×3-3+4
= 12-9+1
= 4
= -3×3+2+3-5
= -9-0
= -9
= -9×3+3-8+5×3
= -9×3+5×3+3-8
= -27+15-5
= -17
= 2-2×3-4×3+4-3
= -2×3-4×3+2+4-3
= -6-12+3
= -15
Bonjour,
= x +1
= -2x -3
-3x -8
-7x +2
x= 3
x +1 -> 3+1= 4
-2x -3 -> -2*3 -3 = -6 -3 = -9
-3x -8 -> -3*3 -8 = -17
-7x +2 -> -7*3 +2 = -19
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Bonjour ,
1.
A = 4x−3−3x+4
= 4x-3x-3+4
=1x+1
B = −3x+2+x−5
= -3x+x+2-5
= -2x-3
C = −9x+x−8+5x
= -9x+x+5x-8
= 15x-8
D = 2−2x−4x+4−x
= 2x-4x-x+2+4
= -7x+6
2 .
Il faut remplacer les x par 3 :
Exemples :
A = 4x−3−3x+4
= 4×3-3-3×3+4
= 4×3-3×3-3+4
= 12-9+1
= 4
B = −3x+2+x−5
= -3×3+2+3-5
= -9-0
= -9
C = −9x+x−8+5x
= -9×3+3-8+5×3
= -9×3+5×3+3-8
= -27+15-5
= -17
D = 2−2x−4x+4−x
= 2-2×3-4×3+4-3
= -2×3-4×3+2+4-3
= -6-12+3
= -15
Bonjour,
A = 4x−3−3x+4
= x +1
B = −3x+2+x−5
= -2x -3
C = −9x+x−8+5x
-3x -8
D = 2−2x−4x+4−x
-7x +2
x= 3
x +1 -> 3+1= 4
-2x -3 -> -2*3 -3 = -6 -3 = -9
-3x -8 -> -3*3 -8 = -17
-7x +2 -> -7*3 +2 = -19