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