Réponses

2014-10-25T11:27:31+02:00
A =(4x-2)(6x+5)-(8x-5)(3x+2)
a = 24x² +20x -12x -10 - 24x² -16x+15x +10
a = 24x²-24x²+20x +15x -12x -16x  -10 +10
a = 7x

C= 3 999 999 998 x 6 000 000 005 - 7 999 999 995 x 3 000 000 002
c = 999 999 996 - 1 999 999 990
c = - 99 999 994

2014-10-25T11:28:29+02:00
A =(4x-2)(6x+5)-(8x-5)(3x+2)
A=4x×6x+4x×5-2×6x-2×5
A=24x²+20x-12x-10
A=24x²+8x-10