numéro: 59, 60, 61 svp

Exercice 59 :
a) 2x - 10 = 2 ( x - 5 )
b) 4y + 16 = 4 ( x + 4 )
c) 6y + 12x = 6 ( y + 2x )
d) 5b - 25a = 5 ( b - 5a )

Exercice 60 : 
a) 2x² + 3x = x ( 2x + 3 )
b) xy - 5x = x ( y - 5 )
c) 7x³ - x² = x² ( 7x - 1 )
d) 8a² + a³ = a² ( 8 + a )

Exercice 61 : 
a) 5x + 15x² = 5x ( 1 + 3x )
b) - 3y - 6y² = -3y (1 + 2y ) 
c) 8a - 2a² = 2a ( 4 - a )
d) 5 ab - 25a = 5a ( b - 5 )