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Sagot :

la longueur est L = 18

on a L = 18 + 2 × M

si m = 2kg

donc L = 18 +2×2=18+4=22cm

si m =1.5kg

donc L = 18+2×1.5=18+3=21cm

si m=800g =0.8kg

donc L = 18 + 2 × 0.8kg=18+1.6=19.6cm

bon courage

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