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Sagot :

Bjr

Exercice 2)

Longueur perche :

80 cm → 0,8 m

= 5²+12²

= 25+144

= 169

= √169

= 13m

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= 13²-11,2²

= 169-125,44

= 43,56

= √43,56

= 6,6m

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6,6 - 5 = 1,6

Donc ? = 1,6m

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