Aider moi svp j y comprend rien!!!!!!!!!!!!!!!!!!svp merci d avance nounoursrose

1
A = V18 +2V8 +4V32 = V(9*2) +2 V(4*2) + 4V(16*2) = 3V2 + 4V2 + 16V2 = 23V2
B = V160 + V40 + V90 = V(16*10) + V( 4*10) + V(9*10) = 4V10 + 2V10 + 3V10 = 12V10

C = (3V5 + V3)² = (3V5)² + (V3)² + 6V(5*3) = (9*5)+(3) +(6V15) = 48 + 6V15

D = (4V6 - 5V5)² = (4V6)² +(5V5)² - 40V(6*5) = 96 + 125 -40V30 = 221 - 40V30
E = (2-5V7)(2+5V7) = (2)² - (5V7)² = 4 - (25 * 7) = 171

F = (36V28) / 8V63 = (36V(4*7) ) / (8V(9*7) simplification par V7
F = (36*2) / (3*8) = (3*24) / 24 = 3

Réponses

2013-12-15T09:49:30+01:00
Bonjour
Exercice 4
A = (2x-9)² + (2x-9)(-9x+6)
A =  (2x-9)(2x-9) +(-9x+6)
a = (2x-9)(2x-9-9x+6)
A = (2x-9)(-7x -3)

B = 100x² -49
B = (10x-7)(10x+7)

C = - (4x-8)(-3x-2) +16x² -64
C = - (4x-8)(-3x-2) +(4x-8)(4x+8)
C = - (4x-8)(-3x-2 + 4x+8)
C = - (4x-8) ( x +6)

D = 4 - (10x +7)²
D = (2 -10x -7)(2  +10x+7)
D = (-10x -5)(10x +9)

E = - ((4x+10) + (2x+9)(4x+10)
E = - (4x+10)(2x+9)

F = (4x+3)(-8x-5) + (10x+8)(4x+3)
F = (4x+3)(-8x-5 + 10x +8)
F = (4x+3)( 2x +3)

Voilà pour la 1ere partie, je regarde le reste, tes calculs sont longs