Sagot :
bonjour
A = x * 3 + x * 5x = x (3+5x)
B = x * 4y - x * 2 = x (4y-2)
C = 4 * 2 - 4 * x = 4 (2-x)
D = 5 * 5x + 5 * 7y = 5(5x+7y)
bonjour
on cherche les facteurs communs aux deux termes de chaque somme ou différence
a) 3x + 5x² = 3x + 5xx
= 3x + 5xx
= x(3 + 5x)
b) 4xy - 2x = 2*2xy - 2x
= 2*2xy - 2x*1
= 2x(2y - 1)
c) 8 - 4x = 4*2 - 4x
= 4*2 - 4x
=4(2 - x)
d) 25x + 35y = 5*5x + 5*7y
= 5*5x + 5*7y
= 5(5x + 7y)