Réponses

2013-10-21T11:24:00+02:00
1. 16+4(5-2x)=16+20-8x=36-8x

2. 16-(-4)(5-2(-1/2)=16+4(5+1)=16+4*6=16+24=40
2013-10-21T11:28:20+02:00
D = 16 - ( -4 ) ( 5 - 2x )   
= 16 - (-4) * 5 + (-4) * (-2x)
= 16 - (-20) + 8x
= 36 + 8x

D = 16 - ( -4 ) ( 5 - 2 x (-1/2 ) )   
= 16 + 4 ( 5 + 1)
= 16 + 4 * 6
= 16 + 24
= 40