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Sagot :

AB = 1cm
BC = 3,5cm
CD = 4,2cm

DONC,
DE = ??

AB + BC = CD + DE
=> DE =( AB + BC ) - CD
=> DE = ( 1 + 3,5 ) - 4,2
=> DE = 4,5 - 4,2
=> DE = 0,3

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