Sagot :
Salut !
2(4x+8) = 2×4x + 2×8 = 8x+16
9(14-7y) = 9×14 - 9×7y = 126-63y
-3(-7-4a) = -3×(-7) - 3×(-4a) = 21+12a
4x(5x-9a) = 4x×5x - 4x×9a = 20x²-36xa
Réponse:
bonjour ,
a ) 2*4x+2*8
8x+16
b) 9*14-9*7y
126 - 63y
c) 21 + 12a
d) 4x*5x-4x*-9a
20x² + 36a