bonjours je suis bloquer a ce developpement d'expression.: ) J= 3x (a+5) K= 2 x (7-b) L=4 x (8+c) M= 5 x (d-9) N= -3 x (a+5) P= -6 x (-4 + b) R= -7(c-8) S= -5 (

Réponse:

bonsoir,

J= 2x (a+5)

= 2x × a + 2x × 5

= 2xa + 10x

K= 2x (7-b)

= 2x × 7 +2x ×(-b)

= 14x - 2xb

L= 4x (8+c)

= 4x × 8 +4x × c

= 32x +4xc

M= 5x (d-9)

= 5x × d +5x ×(-9)

= 5xd -45x

N= -3x (a+5)

=-3x × a -3x × 5

= -3xa -15x

P= -6x (-4+b)

= -6x × (-4) -6x × b

= 24x -6xb

R= -7 (c-8)

= -7 × c -7 × 8

=-7c -56

S= -5 (-1+d)

= -5× (-1) -5 × d

= 5 - 5d

Explications étape par étape:

voilà