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Sagot :

exo 6

aire = (1,5x3÷2)+(5x6)+(3x1÷2)

= 2,25+30+1,5

=33,75m carré

exo 12

aire = (2*2)+(2*1,5÷2)

=4+1,5

=5,5 dm carré

périmètre= (3*2)+2,5+1,5

= 6+4

=7 dm

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