Réponses

2013-03-07T19:12:14+01:00
3x+6 = 3(x+2)

2a-4b = 2(a-2b)

(5x+1)((2x+3)+(5x+1))
2013-03-07T19:12:55+01:00

3x+6 = 3(x+2)

 

2a-4b = 2(a-2b)

 

(5x+1)(2x+3) + (5x+1)(x+2) = (5x+1) [(2x+3) + (x+2)]

= (5x+1)(2x +3 +x +2)

= (5x+1)(3x+5)

 

(4x-5)(7x-1)-(4x-5)(3x+4) = (4x-5) [(7x-1) - (3x+4)]

= (4x-5)(7x -1 -3x -4)

= (4x-5)(4x-5)