Sagot :
Bonjour,
A = 3(2x – 8)=
6x -24
B = 5(3 – 2t) - 2(7t-3)=
15 -10t -14t +6=
-24t +21
C = (3x + 5)(2x - 3)=
6x² -9x +10x -15=
6x² +x -15
D = (5x-8)(5x + 8)=
25x² +40x -40x -64 =
25x² -64
E = (3x - 1)²=
9x² -6x +1
F = (2x - 3)(3x - 5) + (2x - 3)²=
6x² -10x -9x +15 + 4x² -12x +9=
10x² -31x +24
Réponse :
A= 3 x 2x - 3 x 8
A= 6x - 24
B= 5 x 3 - 5 x 2t - 2 x 7t -2 x 3
B= 15-10t-14t+6
B=21-24t
C= 3x x 2x + 3x (-3) + 5 x 2x + 5 x (-3)
C= 6x² -9x + 10x -15
C= 6x² + x -15
D= (5x)² - 8²
D= 25x²- 64 ( identité remarquable)
E= (3x)²-(2 x 3x x 1) +1² (identité remarquable)
E= 9x² - 6x +1
F=6x²-10x-9x+15+4x²-12x+9
F=10x²-31x+24