Help svp urgent ! Maths ex 86 :)
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1. a) (racine8+racine2)(racine2)=racine8*racine2+(racine2)²=4+2=6
b) Aire = c² = (racine8+racine2)²=8+2*racine8*racine2+2=8+2*racine16+2=18
2. si d= c*racine2 alors c=(d*racine2)/2
Donc c=(racine40*racine2)/2=(2*racine20)/2=2*racine5
c est bien de la forme a*racine5 :)